Organometallic compound, organic light-emitting device including the same, and diagnostic composition including the organometallic compound

ABSTRACT

wherein, in Formula 1, groups and variables are the same as described in the specification.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to Korean Patent Applications Nos. 10-2017-0113560, filed on Sep. 5, 2017, and 10-2018-0104722, filed on Sep. 3, 2018, in the Korean Intellectual Property Office, and all the benefits accruing therefrom under 35 U.S.C. § 119, the content of which is incorporated herein in its entirety by reference.

BACKGROUND 1. Field

One or more embodiments relate to an organometallic compound, an organic light-emitting device including the same, and a diagnostic composition including the organometallic compound.

2. Description of the Related Art

Organic light-emitting devices (OLEDs) are self-emission devices, which have superior characteristics in terms of a viewing angle, a response time, a brightness, a driving voltage, and a response speed, and which produce full-color images.

In an example, an organic light-emitting device includes an anode, a cathode, and an organic layer disposed between the anode and the cathode, wherein the organic layer includes an emission layer. A hole transport region may be disposed between the anode and the emission layer, and an electron transport region may be disposed between the emission layer and the cathode. Holes provided from the anode may move toward the emission layer through the hole transport region, and electrons provided from the cathode may move toward the emission layer through the electron transport region. The holes and the electrons recombine in the emission layer to produce excitons. These excitons transit from an excited state to a ground state, thereby generating light.

Meanwhile, luminescent compounds may be used to monitor, sense, or detect a variety of biological materials including cells and proteins. An example of the luminescent compounds includes a phosphorescent luminescent compound.

Various types of organic light emitting devices are known. However, there still remains a need in OLEDs having low driving voltage, high efficiency, high brightness, and long lifespan.

SUMMARY

Aspects of the present disclosure provide an organometallic compound, an organic light-emitting device including the organometallic compound, and a diagnostic composition including the organometallic compound.

Additional aspects will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the presented embodiments.

An aspect of the present disclosure provides an organometallic compound represented by Formula 1:

In Formula 1, M may be a transition metal,

in Formula 1, X₁ may be nitrogen (N),

in Formula 1, X₂ to X₄ may each independently be carbon (C) or N,

in Formula 1, a bond between X₁ and M may be a coordinate bond, and one bond selected from a bond between X₂ and M, a bond between X₃ and M, and a bond between X₄ and M may be a coordinate bond while the remaining two bonds are each independently a covalent bond,

in Formula 1, n is 0 or 1, wherein, when n is 0, CY₁ and CY₄ may not be linked each other,

in Formula 1, i) when n is 0, CY₁ may be a group represented by one selected from Formulae A1-1 to A1-6, and ii) when n is 1, CY₁ may be a group represented by one selected from Formulae A11-1 to A11-4,

in Formulae A1-1 to A1-6 and A11-1 to A11-4,

i) X₁₁ may be *—N[(L₁₁)_(c11)-(R₁₁)]—*′, *—B(R₁₁)—*′, *—P(R₁₁)—*′, *—C(R_(11a))(R_(11b))—*′, *—Si(R_(11a))(R_(11b))—*′, *—Ge(R_(11a))(R_(11b))—*′, *—S—*′, *—Se—*′, *—O—*′, *—C(═O)—*′, *—S(═O)—*′, *—S(═O)₂—*′, or *—C(═S)—*′, X₁₂ may be C(R₁₂) or N, X₁₃ may be C(R₁₃) or N, X₁₄ may be C(R₁₄) or N, and X₁₅ may be C(R₁₅) or N,

ii) when X₁₄ is C(R₁₄) and X₁₅ is C(R₁₅), R₁₄ and R₁₅ may not be linked each other,

iii) R_(11a) and R_(11b) may optionally be linked each other via a second linking group to forma substituted or unsubstituted C₅-C₃₀ carbocyclic group or a substituted or unsubstituted C₁-C₃₀ heterocyclic group,

in Formulae A1-1 to A1-6 and A11-1 to A11-4, * may indicate a binding site to M in Formula 1, *′ may indicate a binding site to T₁ in Formula 1, and *″ may indicate a binding site to T₄ in Formula 1,

in Formula 1, CY₂ to CY₄ may each independently be selected from a C₅-C₃₀ carbocyclic group and a C₁-C₃₀ heterocyclic group,

in Formula 1, T₁ to T₄ may each independently be selected from a single bond, a double bond, *—N[(L₅)_(c5)-(R₅)]—*′, *—B(R₅)—*′, *—P(R₅)—*′, *—C(R₅)(R₆)—*′, *—Si(R₅)(R₆)—*′, *—Ge(R₅)(R₆)—*′, *—S—*′, *—Se—*′, *—O—*, *—C(═O)—*′, *—S(═O)—*′, *—S(═O)₂—*′, *—C(R₅)═*′, *═C(R₅)—*′, *—C(R₅)═C(R₆)—*′, *—C(═S)—*′, and *—C≡C—*′, wherein R₅ and R₆ may optionally be linked each other via a first linking group to forma substituted or unsubstituted C₅-C₃₀ carbocyclic group or a substituted or unsubstituted C₁-C₃₀ heterocyclic group,

L₅ and L₁₁ may each independently be selected from a single bond, a substituted or unsubstituted C₅-C₃₀ carbocyclic group and a substituted or unsubstituted C₁-C₃₀ heterocyclic group,

c5 and c11 may each independently be an integer from 1 to 3, wherein, when c5 is two or more, two or more of groups L₅ may be identical to or different from each other, and when c11 is two or more, two or more of groups L₁₁ may be identical to or different from each other,

R₂ to R₆, R₁₁ to R₁₅, R_(11a), and R_(11b) may each independently be selected from hydrogen, deuterium, —F, —Cl, —Br, —I, —SF₅, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a substituted or unsubstituted C₁-C₆₀ alkyl group, a substituted or unsubstituted C₂-C₆₀ alkenyl group, a substituted or unsubstituted C₂-C₆₀ alkynyl group, a substituted or unsubstituted C₁-C₆₀ alkoxy group, a substituted or unsubstituted C₃-C₁₀ cycloalkyl group, a substituted or unsubstituted C₁-C₁₀ heterocycloalkyl group, a substituted or unsubstituted C₃-C₁₀ cycloalkenyl group, a substituted or unsubstituted C₁-C₁₀ heterocycloalkenyl group, a substituted or unsubstituted C₆-C₆₀ aryl group, a substituted or unsubstituted C₇-C₆₀ alkyl aryl group, a substituted or unsubstituted C₆-C₆₀ aryloxy group, a substituted or unsubstituted C₆-C₆₀ arylthio group, a substituted or unsubstituted C₇-C₆₀ aryl alkyl group, a substituted or unsubstituted C₁-C₆₀ heteroaryl group, a substituted or unsubstituted C₂-C₆₀ alkyl heteroaryl group, a substituted or unsubstituted C₁-C₆₀ heteroaryloxy group, a substituted or unsubstituted C₁-C₆₀ heteroarylthio group, a substituted or unsubstituted C₂-C₆₀ heteroaryl alkyl group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group, —N(Q₁)(Q₂), —Si(Q₃)(Q₄)(Q₅), —B(Q₆)(Q₇), and —P(═O)(Q₈)(Q₉),

in Formula 1, a2 to a4 may each independently be an integer from 0 to 20,

in Formula 1, two or more selected from groups R₂ in the number of a2 may optionally be linked each other to forma substituted or unsubstituted C₅-C₃₀ carbocyclic group or a substituted or unsubstituted C₁-C₃₀ heterocyclic group,

in Formula 1, two or more selected from groups R₃ in the number of a3 may optionally be linked each other to form a substituted or unsubstituted C₅-C₃₀ carbocyclic group or a substituted or unsubstituted C₁-C₃₀ heterocyclic group,

in Formula 1, two or more selected from groups R₄ in the number of a4 may optionally be linked each other to form a substituted or unsubstituted C₅-C₃₀ carbocyclic group or a substituted or unsubstituted C₁-C₃₀ heterocyclic group,

in Formula 1, two or more of R₂ to R₄ may optionally be linked each other to form a substituted or unsubstituted C₅-C₃₀ carbocyclic group or a substituted or unsubstituted C₁-C₃₀ heterocyclic group,

in Formula 1, one of R₅ and R₆ and one of R₂ to R₄ may optionally be linked each other to form a substituted or unsubstituted C₅-C₃₀ carbocyclic group or a substituted or unsubstituted C₁-C₃₀ heterocyclic group,

at least one substituent of the substituted C₅-C₃₀ carbocyclic group, the substituted C₁-C₃₀ heterocyclic group, the substituted C₁-C₆₀ alkyl group, the substituted C₂-C₆₀ alkenyl group, the substituted C₂-C₆₀ alkynyl group, the substituted C₁-C₆₀ alkoxy group, the substituted C₃-C₁₀ cycloalkyl group, the substituted C₁-C₁₀ heterocycloalkyl group, the substituted C₃-C₁₀ cycloalkenyl group, the substituted C₁-C₁₀ heterocycloalkenyl group, the substituted C₆-C₆₀ aryl group, the substituted C₇-C₆₀ alkyl aryl group, the substituted C₆-C₆₀ aryloxy group, the substituted C₆-C₆₀ arylthio group, the substituted C₇-C₆₀ aryl alkyl group, the substituted C₁-C₆₀ heteroaryl group, the substituted C₂-C₆₀ alkyl heteroaryl group, the substituted C₁-C₆₀ heteroaryloxy group, the substituted C₁-C₆₀ heteroarylthio group, the C₂-C₆₀ heteroaryl alkyl group, the substituted monovalent non-aromatic condensed polycyclic group, and the substituted monovalent non-aromatic condensed heteropolycyclic group may be selected from:

deuterium, —F, —Cl, —Br, —I, —CD₃, —CD₂H, —CDH₂, —CF₃, —CF₂H, —CFH₂, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, and a C₁-C₆₀ alkoxy group;

a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, and a C₁-C₆₀ alkoxy group, each substituted with at least one selected from deuterium, —F, —Cl, —Br, —I, —CD₃, —CD₂H, —CDH₂, —CF₃, —CF₂H, —CFH₂, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₇-C₆₀ alkyl aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₇-C₆₀ aryl alkyl group, a C₁-C₆₀ heteroaryl group, a C₂-C₆₀ alkyl heteroaryl group, a C₁-C₆₀ heteroaryloxy group, a C₁-C₆₀ heteroarylthio group, a C₂-C₆₀ heteroaryl alkyl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, —N(Q₁₁)(Q₁₂), —Si(Q₁₃)(Q₁₄)(Q₁₅), —B(Q₁₆)(Q₁₇), and —P(═O)(Q₁₈)(Q₁₉);

a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₇-C₆₀ alkyl aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₇-C₆₀ aryl alkyl group, a C₁-C₆₀ heteroaryl group, a C₁-C₆₀ heteroaryloxy group, a C₁-C₆₀ heteroarylthio group, a C₂-C₆₀ heteroaryl alkyl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group;

a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₇-C₆₀ alkyl aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₇-C₆₀ aryl alkyl group, a C₁-C₆₀ heteroaryl group, a C₂-C₆₀ alkyl heteroaryl group, a C₁-C₆₀ heteroaryloxy group, a C₁-C₆₀ heteroarylthio group, a C₂-C₆₀ heteroaryl alkyl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group, each substituted with at least one selected from deuterium, —F, —Cl, —Br, —I, —CD₃, —CD₂H, —CDH₂, —CF₃, —CF₂H, —CFH₂, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₇-C₆₀ alkyl aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₇-C₆₀ aryl alkyl group, a C₁-C₆₀ heteroaryl group, a C₂-C₆₀ alkyl heteroaryl group, a C₁-C₆₀ heteroaryloxy group, a C₁-C₆₀ heteroarylthio group, a C₂-C₆₀ heteroaryl alkyl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, —N(Q₂₁)(Q₂₂), —Si(Q₂₃)(Q₂₄)(Q₂₅), —B(Q₂₆)(Q₂₇), and —P(═O)(Q₂₈)(Q₂₉); and

—N(Q₃₁)(Q₃₂), —Si(Q₃₃)(Q₃₄)(Q₃₅), —B(Q₃₆)(Q₃₇), and —P(═O)(Q₃₈)(Q₃₉);

Q₁ to Q₉, Q₁₁ to Q₁₉, Q₂₁ to Q₂₉, and Q₃₁ to Q₃₉ may each independently be selected from hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryl group substituted with at least one selected from a C₁-C₆₀ alkyl group, and a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₇-C₆₀ aryl alkyl group, a C₁-C₆₀ heteroaryl group, a C₂-C₆₀ alkyl heteroaryl group, a C₁-C₆₀ heteroaryloxy group, a C₁-C₆₀ heteroarylthio group, a C₂-C₆₀ heteroaryl alkyl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group.

Another aspect of the present disclosure provides an organic light-emitting device including:

a first electrode,

a second electrode, and

an organic layer disposed between the first electrode and the second electrode and including an emission layer,

wherein the organic layer includes at least one of the organometallic compound.

The organometallic compound may act as a dopant in the organic layer.

Another aspect of the present disclosure provides a diagnostic composition including at least one organometallic compound represented by Formula 1.

BRIEF DESCRIPTION OF THE DRAWINGS

These and/or other aspects will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic view of an organic light-emitting device according to an embodiment;

FIG. 2 is a graph of normalized intensity (arbitrary units, arb. units) versus a distance from λ_(max) (nanometers, nm) showing an electroluminescence spectrum of each of organic light-emitting devices prepared according to Examples 1, 3, and 6 and Comparative Examples A to C; and

FIG. 3 is a graph of emission efficiency at CIE_(x)=0.685 (candelas per ampere, cd/A) versus emission intensity at λmax-50 nm (arbitrary units, a. u.) showing emission efficiency (at CIE_(x)=0.685) of each of organic light-emitting devices prepared according to Examples 16 to 18 and Comparative Examples D to F.

DETAILED DESCRIPTION

Reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. In this regard, the present embodiments may have different forms and should not be construed as being limited to the descriptions set forth herein. Accordingly, the embodiments are merely described below, by referring to the figures, to explain aspects of the present description. Expressions such as “at least one of,” when preceding a list of elements, modify the entire list of elements and do not modify the individual elements of the list.

It will be understood that when an element is referred to as being “on” another element, it can be directly in contact with the other element or intervening elements may be present therebetween. In contrast, when an element is referred to as being “directly on” another element, there are no intervening elements present.

It will be understood that, although the terms first, second, third etc. may be used herein to describe various elements, components, regions, layers, and/or sections, these elements, components, regions, layers, and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer, or section from another element, component, region, layer, or section. Thus, a first element, component, region, layer, or section discussed below could be termed a second element, component, region, layer, or section without departing from the teachings of the present embodiments.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, the singular forms “a,” “an,” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise.

The term “or” means “and/or.” It will be further understood that the terms “comprises” and/or “comprising,” or “includes” and/or “including” when used in this specification, specify the presence of stated features, regions, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, regions, integers, steps, operations, elements, components, and/or groups thereof.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this general inventive concept belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Exemplary embodiments are described herein with reference to cross section illustrations that are schematic illustrations of idealized embodiments. As such, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, embodiments described herein should not be construed as limited to the particular shapes of regions as illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. For example, a region illustrated or described as flat may, typically, have rough and/or nonlinear features. Moreover, sharp angles that are illustrated may be rounded. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the precise shape of a region and are not intended to limit the scope of the present claims.

“About” or “approximately” as used herein is inclusive of the stated value and means within an acceptable range of deviation for the particular value as determined by one of ordinary skill in the art, considering the measurement in question and the error associated with measurement of the particular quantity (i.e., the limitations of the measurement system). For example, “about” can mean within one or more standard deviations, or within ±30%, 20%, 10%, 5% of the stated value.

In an embodiment, an organometallic compound is provided. The organometallic compound according to an embodiment is represented by Formula 1:

In Formula 1, M may be a transition metal. For example, in formula 1, M may be a first-row transition metal of the Periodic Table of Elements, a second-row transition metal of the Periodic Table of Elements, or a third-row transition metal of the Periodic Table of Elements.

For example, M may be beryllium (Be), magnesium (Mg), aluminum (Al), calcium (Ca), titanium (Ti), manganese (Mn), cobalt (Co), copper (Cu), zinc (Zn), gallium (Ga), germanium (Ge), zirconium (Zr), ruthenium (Ru), rhodium (Rh), palladium (Pd), silver (Ag), rhenium (Re), platinum (Pt), or gold (Au).

In an embodiment, M may be Pt, Pd, or Au, but embodiments of the present disclosure are not limited thereto.

In Formula 1, X₁ may be N, and X₂ to X₄ may each independently be carbon (C) or nitrogen (N).

For example, in Formula 1, i) X₂ and X₃ may each independently be C, and X₄ may be N; ii) X₂ and X₄ may each independently be C, and X₃ may be N, but embodiments of the present disclosure are not limited thereto.

In Formula 1, a bond between X₁ and M may be a coordinate bond, and one bond selected from a bond between X₂ and M, a bond between X₃ and M, and a bond between X₄ and M may be a coordinate bond while the remaining two bonds may each independently be a covalent bond, and in this regard, the organometallic compound represented by Formula 1 may be electrically neutral. In this regard, for example, the organometallic compound represented by Formula 1 may be clearly distinguished from a virtual organometallic compound that is not electrically neutral, in a way that: i) in Formula 1, one bone selected from a bond between X₁ and M, a bond between X₂ and M, a bond between X₃ and M, and a bond between X₄ and M may be a covalent bond while the remaining three bonds may each independently be a coordinate bond; or ii) in Formula 1, three bonds selected from a bond between X₁ and M, a bond between X₂ and M, a bond between X₃ and M, and a bond between X₄ and M may each independently be a covalent bond while the remaining one bond may be a coordinate bond.

For example, in Formula 1, i) a bond between X₁ and M and a bond between X₄ and M may each independently be a coordinate bond, and a bond between X₂ and M and a bond between X₃ and M may each independently be a covalent bond; or ii) a bond between X₁ and M and a bond between X₃ and M may each independently be a coordinate bond, and a bond between X₂ and M and a bond between X₄ and M may each independently be a covalent bond.

In one or more embodiments, in Formula 1,

M may be Pt, Pd, or Au,

X₄ may be N,

a bond between X₄ and M may be a coordinate bond, but embodiments of the present disclosure are not limited thereto.

In Formula 1, n may be 0 or 1, wherein, when n is 0, CY₁ and CY₄ may not be linked each other.

In Formula 1, i) when n is 0, CY₁ may be a group represented by one selected from Formulae A1-1 to A1-6, and ii) when n is 1, CY₁ may be a group represented by one selected from Formulae A11-1 to A11-4. In Formulae A1-1 to A1-6 and A11-1 to A11-4, X₁₁ may be *—N[(L₁₁)_(c11)-(R₁₁)]—*′, *—B(R₁₁)—*′, *—P(R₁₁)—*′, *—C(R_(11a))(R_(11b))—*′, *—Si(R_(11a))(R_(11b))—*′, *—Ge(R_(11a))(R_(11b))—*′, *—S—*′, *—Se—*′, *—O—*′, *—C(═O)—*′, *—S(═O)—*′, *—S(═O)₂—*′, or *—C(═S)—*′, X₁₂ may be C(R₁₂) or N, X₁₃ may be C(R₁₃) or N, X₁₄ may be C(R₁₄) or N, and X₁₅ may be C(R₁₅) or N:

For example, in Formulae A1-1 to A1-6 and A11-1 to A11-4, X₁₂ may be C(R₁₂), X₁₃ may be C(R₁₃), X₁₄ may be C(R₁₄), and X₁₅ may be C(R₁₅).

In an embodiment, in Formulae A1-1 to A1-6 and A11-1 to A11-4, X₁₄ may be C(R₁₄), X₁₅ may be C(R₁₅), and at least one selected from R₁₄ and R₁₅ may not be hydrogen.

In Formulae A1-1 to A1-6 and A11-1 to A11-4, when X₁₄ is C(R₁₄) and X₁₅ is C(R₁₅), R₁₄ and R₁₅ may not be linked each other. That is, in Formulae A1-1 to A1-6 and A11-1 to A11-4, when X₁₄ is C(R₁₄) and X₁₅ is C(R₁₅), R₁₄ and R₁₅ may not form a ring by linking each other.

In an embodiment, R_(11a) and R_(11b) may optionally be linked each other via a second linking group to form a substituted or unsubstituted C₅-C₃₀ carbocyclic group or a substituted or unsubstituted C₁-C₃₀ heterocyclic group. The second linking group may be the same as described in connection with the first linking group in the present specification.

Formulae A1-1 to A1-6 and A11-1 to A11-4 are described below.

In Formula 1, CY₂ to CY₄ may each independently be selected from a C₅-C₃₀ carbocyclic group and a C₁-C₃₀ heterocyclic group.

For example, in Formula 1, CY₂ to CY₄ may each independently be selected from a benzene group, a naphthalene group, an anthracene group, a phenanthrene group, a triphenylene group, a pyrene group, a chrysene group, a cyclopentadiene group, a 1,2,3,4-tetrahydronaphthalene group, a thiophene group, a furan group, an indole group, a benzoborole group, a benzophosphole group, an indene group, a benzosilole group, a benzogermole group, a benzothiophene group, a benzoselenophene group, a benzofuran group, a carbazole group, a dibenzoborole group, a dibenzophosphole group, a fluorene group, a dibenzosilole group, a dibenzogermole group, a dibenzothiophene group, a dibenzoselenophene group, a dibenzofuran group, a dibenzothiophene 5-oxide group, a 9H-fluorene-9-one group, a dibenzothiophene 5,5-dioxide group, an azaindole group, an azabenzoborole group, an azabenzophosphole group, an azaindene group, an azabenzosilole group, a benzogermole group, an azabenzothiophene group, an azabenzoselenophene group, an azabenzofuran group, an azacarbazole group, an azadibenzoborole group, an azadibenzophosphole group, an azafluorene group, an azadibenzosilole group, an azadibenzogermole group, an azadibenzothiophene group, an azadibenzoselenophene group, an azadibenzofuran group, an azadibenzothiophene 5-oxide group, an aza-9H-fluorene-9-one group, an azadibenzothiophene 5,5-dioxide group, a pyridine group, a pyrimidine group, a pyrazine group, a pyridazine group, a triazine group, a quinoline group, an isoquinoline group, a quinoxaline group, a quinazoline group, a phenanthroline group, a pyrrole group, a pyrazole group, an imidazole group, a triazole group, an oxazole group, an isooxazole group, a thiazole group, an isothiazole group, an oxadiazole group, a thiadiazole group, a benzopyrazole group, a benzimidazole group, a benzoxazole group, a benzothiazole group, a benzooxadiazole group, a benzothiadiazole group, a 5,6,7,8-tetrahydroisoquinoline group, and a 5,6,7,8-tetrahydroquinoline group.

In one or more embodiments, in Formula 1,

X₂ and X₃ may each independently be C, and

CY₂ and CY₃ may each independently be selected from a benzene group, a naphthalene group, an anthracene group, a phenanthrene group, a triphenylene group, a pyrene group, a chrysene group, a cyclopentadiene group, a 1,2,3,4-tetrahydronaphthalene group, a thiophene group, a furan group, an indole group, a benzoborole group, a benzophosphole group, an indene group, a benzosilole group, a benzogermole group, a benzothiophene group, a benzoselenophene group, a benzofuran group, a carbazole group, a dibenzoborole group, a dibenzophosphole group, a fluorene group, a dibenzosilole group, a dibenzogermole group, a dibenzothiophene group, a dibenzoselenophene group, a dibenzofuran group, a dibenzothiophene 5-oxide group, a 9H-fluorene-9-one group, and a dibenzothiophene 5,5-dioxide group, but embodiments of the present disclosure are not limited thereto.

In one or more embodiments, at least one selected from ring CY₂ to ring CY₄ may each independently be selected from condensed rings in which at least one 5-membered ring and at least one 6-membered ring are condensed each other,

wherein the 5-membered ring may be selected from a cyclopentadiene group, a furan group, a thiophene group, a pyrrole group, a silole group, an oxazole group, an isoxazole group, an oxadiazole group, an isozadiazole group, an oxatriazole group, an isoxatriazole group, a thiazole group, an isothiazole group, a thiadiazole group, an isothiadiazole group, a thiatriazole group, an isothiatriazole group, a pyrazole group, an imidazole group, a triazole group, a tetrazole group, an azasilole group, a diazasilole group, and a triazasilole group, and

the 6-membered ring may be selected from a cyclohexane group, a cyclohexene group, a benzene group, a pyridine group, a pyrimidine group, a pyrazine group, and a pyridazine group, but embodiments of the present disclosure are not limited thereto.

In one or more embodiments, in Formula 1, CY₁ and CY₄ may be identical to each other.

In one or more embodiments, in Formula 1, CY₂ and CY₃ may be identical to each other.

In Formula 1, T₁ to T₄ may each independently be selected from a single bond, a double bond, *—N[(L₅)_(c5)-(R₅)]—*′, *—B(R₅)—*′, *—P(R₅)—*′, *—C(R₅)(R₆)—*′, *—Si(R₅)(R₆)—*′, *—Ge(R₅)(R₆)—*′, *—S—*′, *—Se—*′, *—O—*′, *—C(═O)—*′, *—S(═O)—*′, *—S(═O)₂—*′, *—C(R₅)═*′, *═C(R₅)—*′, *—C(R₅)═C(R₆)—*′, *—C(═S)—*′, and *—C≡C—*′, wherein R₅ and R₆ may each independently be the same as described above, and may optionally be linked each other to form a substituted or unsubstituted C₅-C₃₀ carbocyclic group or a substituted or unsubstituted C₁-C₃₀ heterocyclic group via a single bond, a double bond, or a first linking group.

The first linking group may be selected from *—N(R₉)—*′, *—B(R₉)—*′, *—P(R₉)—*′, *—C(R₉)(R₁₀)—*′, *—Si(R₉)(R₁₀)—*′, *—Ge(R₉)(R₁₀)—*′, *—S—*′, *—Se—*′, *—O—*′, *—C(═O)—*′, *—S(═O)—*′, *—S(═O)₂—*′, *—C(R₉)═*′, *═C(R₉)—*′, *—C(R₉)═C(R₁₀)—*′, *—C(═S)—*′, and *—C≡C—*′, wherein R₉ and R₁₀ may each independently be the same as described in connection with R₅ in the present specification, and * and *′ each independently indicate a binding site to a neighboring atom.

In an embodiment, L₅ and L₁₁ may each independently be selected from a single bond, a substituted or unsubstituted C₅-C₃₀ carbocyclic group, and a substituted or unsubstituted C₁-C₃₀ heterocyclic group.

For example, L₅ and L₁₁ may each independently be selected from:

a single bond, a benzene group, a naphthalene group, an anthracene group, a phenanthrene group, a triphenylene group, a pyrene group, a chrysene group, a cyclopentadiene group, a furan group, a thiophene group, a silole group, an indene group, a fluorene group, an indole group, a carbazole group, a benzofuran group, a dibenzofuran group, a benzothiophene group, a dibenzothiophene group, a benzosilole group, a dibenzosilole group, an azafluorene group, an azacarbazole group, an azadibenzofuran group, an azadibenzothiophene group, an azadibenzosilole group, a pyridine group, a pyrimidine group, a pyrazine group, a pyridazine group, a triazine group, a quinoline group, an isoquinoline group, a quinoxaline group, a quinazoline group, a phenanthroline group, a pyrrole group, a pyrazole group, an imidazole group, a triazole group, an oxazole group, an isooxazole group, a thiazole group, an isothiazole group, an oxadiazole group, a thiadiazole group, a benzopyrazole group, a benzimidazole group, a benzoxazole group, a benzothiazole group, a benzooxadiazole group and a benzothiadiazole group; and

a benzene group, a naphthalene group, an anthracene group, a phenanthrene group, a triphenylene group, a pyrene group, a chrysene group, a cyclopentadiene group, a furan group, a thiophene group, a silole group, an indene group, a fluorene group, an indole group, a carbazole group, a benzofuran group, a dibenzofuran group, a benzothiophene group, a dibenzothiophene group, a benzosilole group, a dibenzosilole group, an azafluorene group, an azacarbazole group, an azadibenzofuran group, an azadibenzothiophene group, an azadibenzosilole group, a pyridine group, a pyrimidine group, a pyrazine group, a pyridazine group, a triazine group, a quinoline group, an isoquinoline group, a quinoxaline group, a quinazoline group, a phenanthroline group, a pyrrole group, a pyrazole group, an imidazole group, a triazole group, an oxazole group, an isooxazole group, a thiazole group, an isothiazole group, an oxadiazole group, a thiadiazole group, a benzopyrazole group, a benzimidazole group, a benzoxazole group, a benzothiazole group, a benzooxadiazole group, and a benzothiadiazole group, each substituted with at least one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a phenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, a triazinyl group, a fluorenyl group, a dimethylfluorenyl group, a diphenylfluorenyl group, a carbazolyl group, a phenylcarbazolyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a dibenzosilolyl group, a dimethyl dibenzosilolyl group, a diphenyl dibenzosilolyl group, —N(Q₃₁)(Q₃₂), —Si(Q₃₃)(Q₃₄)(Q₃₅), —B(Q₃₆)(Q₃₇), and —P(═O)(Q₃₈)(Q₃₉), and

Q₃₁ to Q₃₉ may each independently be selected from:

—CH₃, —CD₃, —CD₂H, —CDH₂, —CH₂CH₃, —CH₂CD₃, —CH₂CD₂H, —CH₂CDH₂, —CHDCH₃, —CD₂CH₃, —CHDCD₂H, —CHDCDH₂, —CHDCD₃, —CD₂CD₃, —CD₂CD₂H, and —CD₂CDH₂;

an n-propyl group, an iso-propyl group, an n-butyl group, an iso-butyl group, a sec-butyl group, a tert-butyl group, an n-pentyl group, an iso-pentyl group, a sec-pentyl group, a tert-pentyl group, a phenyl group, and a naphthyl group; and

an n-propyl group, an iso-propyl group, an n-butyl group, an iso-butyl group, a sec-butyl group, a tert-butyl group, an n-pentyl group, an iso-pentyl group, a sec-pentyl group, a tert-pentyl group, a phenyl group, and a naphthyl group, each substituted with at least one selected from deuterium, a C₁-C₁₀ alkyl group, and a phenyl group.

Here, c5 and c11 indicate the number of L₅ and L₁₁, respectively, and may each independently be an integer from 1 to 3. In an embodiment, when c5 is two or more, two or more of groups L₅ may be identical to or different from each other, and when c11 is two or more, two or more of groups L₁₁ may be identical to or different from each other. For example, c5 and c11 may each independently be 1 or 2.

In an embodiment, in Formula 1, T₁ may be a single bond, T₂ may not be a single bond, and n may be 0.

In one or more embodiments, in Formula 1, at least one selected from T₁ to T₄ may each independently be selected from *—C(R₅)(R₆)—*′, *—Si(R₅)(R₆)—*′, and *—Ge(R₅)(R₆)—*′, wherein R₅ and R₆ may be linked each other via a first linking group. Here, the first linking group may be the same as described above.

In Formula 1, R₂ to R₆, R₁₁ to R₁₅, R_(11a), and R_(11b) may each independently be selected from hydrogen, deuterium, —F, —Cl, —Br, —I, —SF₅, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a substituted or unsubstituted C₁-C₆₀ alkyl group, a substituted or unsubstituted C₂-C₆₀ alkenyl group, a substituted or unsubstituted C₂-C₆₀ alkynyl group, a substituted or unsubstituted C₁-C₆₀ alkoxy group, a substituted or unsubstituted C₃-C₁₀ cycloalkyl group, a substituted or unsubstituted C₁-C₁₀ heterocycloalkyl group, a substituted or unsubstituted C₃-C₁₀ cycloalkenyl group, a substituted or unsubstituted C₁-C₁₀ heterocycloalkenyl group, a substituted or unsubstituted C₆-C₆₀ aryl group, a substituted or unsubstituted C₇-C₆₀ alkyl aryl group, a substituted or unsubstituted C₆-C₆₀ aryloxy group, a substituted or unsubstituted C₆-C₆₀ arylthio group, a substituted or unsubstituted C₇-C₆₀ aryl alkyl group, a substituted or unsubstituted C₁-C₆₀ heteroaryl group, a substituted or unsubstituted C₂-C₆₀ alkyl heteroaryl group, a substituted or unsubstituted C₁-C₆₀ heteroaryloxy group, a substituted or unsubstituted C₁-C₆₀ heteroarylthio group, a substituted or unsubstituted C₂-C₆₀ heteroaryl alkyl group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group, —N(Q₁)(Q₂), —Si(Q₃)(Q₄)(Q₅), —B(Q₆)(Q₇), and —P(═O)(Q₈)(Q₉).

For example, R₂ to R₆, R₁₁ to R₁₅, R_(11a), and R_(11b) may each independently be selected from:

hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, —SF₅, C₁-C₂₀ alkyl group, and a C₁-C₂₀ alkoxy group;

a C₁-C₂₀ alkyl group and a C₁-C₂₀ alkoxy group, each substituted with at least one selected from deuterium, —F, —Cl, —Br, —I, —CD₃, —CD₂H, —CDH₂, —CF₃, —CF₂H, —CFH₂, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₁₀ alkyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group, a phenyl group, a biphenyl group, a naphthyl group, a pyridinyl group, and a pyrimidinyl group;

a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group, a phenyl group, a biphenyl group, a C₁-C₂₀ alkylphenyl group, a naphthyl group, a fluorenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an isoindolyl group, an indolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, a carbazolyl group, a phenanthrolinyl group, a benzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, an imidazopyridinyl group, and an imidazopyrimidinyl group;

a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group, a phenyl group, a biphenyl group, a C₁-C₂₀ alkylphenyl group, a naphthyl group, a fluorenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an isoindolyl group, an indolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, a carbazolyl group, a phenanthrolinyl group, a benzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, an imidazopyridinyl group, and an imidazopyrimidinyl group, each substituted with at least one selected from deuterium, —F, —Cl, —Br, —I, —CD₃, —CD₂H, —CDH₂, —CF₃, —CF₂H, —CFH₂, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group, a phenyl group, a biphenyl group, a C₁-C₂₀ alkylphenyl group, a naphthyl group, a fluorenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an isoindolyl group, an indolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, a carbazolyl group, a phenanthrolinyl group, a benzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, an imidazopyridinyl group, and an imidazopyrimidinyl group; and

—N(Q₁)(Q₂), —Si(Q₃)(Q₄)(Q₅), —B(Q₆)(Q₇), and —P(═O)(Q₈)(Q₉), and

Q₁ to Q₉ may each independently be selected from:

—CH₃, —CD₃, —CD₂H, —CDH₂, —CH₂CH₃, —CH₂CD₃, —CH₂CD₂H, —CH₂CDH₂, —CHDCH₃, —CD₂CH₃, —CHDCD₂H, —CHDCDH₂, —CHDCD₃, —CD₂CD₃, —CD₂CD₂H, and —CD₂CDH₂;

an n-propyl group, an iso-propyl group, an n-butyl group, an iso-butyl group, a sec-butyl group, a tert-butyl group, an n-pentyl group, an iso-pentyl group, a sec-pentyl group, a tert-pentyl group, a phenyl group, and a naphthyl group; and

an n-propyl group, an iso-propyl group, an n-butyl group, an iso-butyl group, a sec-butyl group, a tert-butyl group, an n-pentyl group, an iso-pentyl group, a sec-pentyl group, a tert-pentyl group, a phenyl group, and a naphthyl group, each substituted with at least one selected from deuterium, a C₁-C₁₀ alkyl group, and a phenyl group.

In one or more embodiments, R₂ to R₆, R₁₁ to R₁₅, R_(11a), and R_(11b) may each independently be selected from hydrogen, deuterium, —F, a cyano group, a nitro group, —SF₅, —CH₃, —CD₃, —CD₂H, —CDH₂, —CF₃, —CF₂H, —CFH₂, a group represented by one selected from Formulae 9-1 to 9-19, a group represented by one selected from Formulae 10-1 to 10-186, and —Si(Q₃)(Q₄)(Q₅) (wherein Q₃ to Q₅ may each independently be the same as described above), but embodiments of the present disclosure are not limited thereto:

In Formulae 9-1 to 9-19 and 10-1 to 10-186, * indicates a binding site to a neighboring atom, Ph indicates a phenyl group, and TMS indicates a trimethylsilyl group.

In an embodiment, R₅ and R₆ may optionally be linked each other via a first linking group to form a substituted or unsubstituted C₅-C₃₀ carbocyclic group or a substituted or unsubstituted C₁-C₃₀ heterocyclic group, and R_(11a) and R_(11b) may optionally be linked each other via a second linking group to form a substituted or unsubstituted C₅-C₃₀ carbocyclic group or a substituted or unsubstituted C₁-C₃₀ heterocyclic group.

In Formula 1, a2 to a4 indicates the number of R₂ to R₄, respectively, and may each independently be an integer form 0 to 20 (for example, an integer from 0 to 4). When a2 is two or more, a plurality of groups R₂ may be identical to or different from each other. When a3 is two or more, a plurality of groups R₃ may be identical to or different from each other. When a4 is two or more, a plurality of groups R₄ may be identical to or different from each other.

In an embodiment, a moiety represented by

in Formula 1 may be represented by one selected from Formulae A2-1(1) to A2-1(21):

In Formulae A2-1(1) to A2-1(21),

X₂ and R₂ may respectively be the same as described above,

X₂₁ may be O, S, N(R₂₁), C(R₂₁)(R₂₂), or Si(R₂₁)(R₂₂),

R₂₁ to R₂₈ may respectively be the same as described in connection with R₂,

a25 may be an integer from 0 to 5,

a24 may be an integer from 0 to 4,

a23 may be an integer from 0 to 3,

a22 may be an integer from 0 to 2,

* indicates a binding site to M in Formula 1,

*′ indicates a binding site to T₁ in Formula 1, and

*″ indicates a binding site to T₂ in Formula 1.

In one or more embodiments, a moiety represented by

in Formula 1 may be represented by one selected from Formulae A3-1(1) to A3-1(21):

In Formulae A3-1(1) to A3-1 (21),

X₃ and R₃ may respectively the same as described above,

X₃₁ may be O, S, N(R₃₁), C(R₃₁)(R₃₂), or Si(R₃₁)(R₃₂),

R₃₁ to R₃₈ may respectively be the same as described in connection with R₃,

a35 may be an integer from 0 to 5,

a34 may be an integer from 0 to 4,

a33 may be an integer from 0 to 3,

a32 may be an integer from 0 to 2,

* indicates a binding site to M in Formula 1,

*′ indicates a binding sit to T₃ in Formula 1, and

*″ indicates a binding site to T₂ in Formula 1.

In one or more embodiments, in Formula 1,

n may be 0, and a moiety represented by

may be represented by one selected from Formulae A4-1 to A4-6, A4-1(1) to A4-1(44), and A4-2(1) to A4-2(71), or

n may be 1, and a moiety represented by

may be represented by one selected from Formulae A14-1 to A14-4 and A14-1(1) to A14-1(17):

In Formulae A4-1 to A4-9, A4-1(1) to A4-1(44), A4-2(1) to A4-2(71), A14-1 to A14-4, and A14-1(1) to A14-1(17),

X₄ and R₄ may respectively be the same as described above,

X₄₁ may be O, S, N(R₄₁), C(R₄₁)(R₄₂), or Si(R₄₁)(R₄₂),

X₄₂ may be N or C(R₄₂),

X₄₃ may be N or C(R₄₃),

X₄₄ may be N or C(R₄₄),

X₄₅ may be N or C(R₄₅),

R₄₁ to R₄₈ may respectively be the same as described in connection with R₄,

a47 may be an integer from 0 to 7,

a46 may be an integer from 0 to 6,

a45 may be an integer from 0 to 5,

a44 may be an integer from 0 to 4,

a43 may be an integer from 0 to 3,

a42 may be an integer from 0 to 2,

* indicates a binding site to M in Formula 1,

*′ indicates a binding site to T₃ in Formula 1, and

*″ indicates a binding site to T₄ in Formula 1.

In one or more embodiments, in Formula 1,

T₃ may be a single bond, n may be 0, and a moiety represented by

may be represented by one selected from Formulae A4-1 to A4-6, A4-1(1) to A4-1(44), and A4-2(1) to A4-2(71); or

T₃ may not be a single bond, n may be 1, and a moiety represented by

may be represented by one selected from Formulae A14-1 to A14-4 and A14-1(1) to A14-1(17), but embodiments of the present disclosure are not limited thereto.

In one or more embodiments, in Formula 1,

n may be 0,

a moiety represented by

may be a group represented by one selected from Formulae CY1-1 to CY1-8 (and/or),

a moiety represented by

may be a group represented by one selected from Formulae CY2-1 to CY2-6 (and/or),

a moiety represented by

may be a group represented by one selected from Formulae CY3-1 to CY3-6 (and/or),

a moiety represented by

may be a group represented by one selected from Formulae CY4-1 to CY4-15, but embodiments of the present disclosure are not limited thereto:

In Formulae CY1-1 to CY1-8, CY2-1 to CY2-6, CY3-1 to CY3-6, and CY4-1 to CY4-15,

X₁ to X₄, X₁₁, R₂, R₃, R₁₄, and R₁₅ may respectively be the same as described above,

X₄₁ may be O, S, N(R₄₁), C(R₄₁)(R₄₂), or Si(R₄₁)(R₄₂),

R_(2a) and R_(2b) may respectively be the same as described in connection with R₂,

R_(3a) and R_(3b) may respectively be the same as described in connection with R₃,

R₄₁, R₄₂, R₄₄, and R₄₅ may respectively be the same as described in connection with R₄,

R₁₄, R₁₅, R₂, R_(2a), R_(2b), R₃, R_(3a), R_(3b), R₄₁, R₄₂, R₄₄, and R₄₅ may not each independently be hydrogen,

* indicates a binding site to M in Formula 1,

in Formulae CY1-1 to CY1-8, *′ indicates a binding site to T₁ in Formula 1,

in Formulae CY2-1 to CY2-6, *′ indicates a binding site to T₁ in Formula 1, and *″ indicates a binding site to T₂ in Formula 1,

in Formulae CY3-1 to CY3-6, *′ indicates a binding site to T₃ in Formula 1, and *″ indicates a binding site to T₂ in Formula 1, and

in Formulae CY4-1 to CY4-15, *′ indicates a binding site to T₃ in Formula 1.

In one or more embodiments, the organometallic compound may be represented by one selected from Formulae 1(1) to 1(6):

In Formulae 1(1) to 1(6),

M, X₁ to X₄, CY₁ to CY₄, T₁ to T₄, n, R₂ to R₄, and a2 to a4 may respectively be the same as described above,

CY₅ to CY₇ may each independently be a C₅-C₃₀ carbocyclic group or a C₁-C₃₀ heterocyclic group,

X₅ to X₇ may each independently be C or N,

R₅₁, R₆₁, and R₇₁ may respectively be the same as described in connection with R₂,

a51, a61, and a71 may each independently be 0, 1, 2, or 3,

T₅ may be C, Si, or Ge,

T₇ may be B, N, or P,

T₆ may be selected from a single bond, *—N[(L₇)_(c7)-(R₇)]—*′, *—B(R₇)—*′, *—P(R₇)—*′, *—C(R₇)(R₈)—*′, *—Si(R₇)(R₈)—*′, *—Ge(R₇)(R₈)—*′, *—S—*′, *—Se—*′, *—O—*′, *—C(═O)—*′, *—S(═O)—*′, *—S(═O)₂—*′, *—C(R₇)═C(R₈)—*′, *—C(═S)—*′, and *—C≡C—*′,

L₇ and c7 may respectively be the same as described in connection with L₅ and c5, and

R₇ and R₈ may respectively be the same as described in connection with R₅.

In Formulae 1(1) to 1(6), CY₅ and CY₆ may respectively be the same as described in connection with CY₂ to CY₄.

In Formula 1, i) two or more among a plurality of neighboring groups R₂ may optionally be linked each other to form a substituted or unsubstituted C₅-C₃₀ carbocyclic group or a substituted or unsubstituted C₁-C₃₀ heterocyclic group, ii) two or more among a plurality of neighboring groups R₃ may optionally be linked each other to form a substituted or unsubstituted C₅-C₃₀ carbocyclic group or a substituted or unsubstituted C₁-C₃₀ heterocyclic group, iii) two or more among a plurality of neighboring groups R₄ may optionally be linked each other to form a substituted or unsubstituted C₅-C₃₀ carbocyclic group or a substituted or unsubstituted C₁-C₃₀ heterocyclic group, iv) two or more selected from R₂ to R₄ may optionally be linked to form a substituted or unsubstituted C₅-C₃₀ carbocyclic group or a substituted or unsubstituted C₁-C₃₀ heterocyclic group, and v) one selected from R₅ and R₆ and one selected from R₂ to R₄ may optionally be linked to form a substituted or unsubstituted C₅-C₃₀ carbocyclic group or a substituted or unsubstituted C₁-C₃₀ heterocyclic group.

For example, in Formula 1, i) a substituted or unsubstituted C₅-C₃₀ carbocyclic group or a substituted or unsubstituted C₁-C₃₀ heterocyclic group formed by optionally linking two or more among a plurality of neighboring groups R₂, ii) a substituted or unsubstituted C₅-C₃₀ carbocyclic group or a substituted or unsubstituted C₁-C₃₀ heterocyclic group formed by optionally linking two or more among a plurality of neighboring groups R₃, iii) a substituted or unsubstituted C₅-C₃₀ carbocyclic group or a substituted or unsubstituted C₁-C₃₀ heterocyclic group formed by optionally linking two or more among a plurality of neighboring groups R₄, iv) a substituted or unsubstituted C₅-C₃₀ carbocyclic group or a substituted or unsubstituted C₁-C₃₀ heterocyclic group formed by optionally linking two or more selected from R₂ to R₄, and v) a substituted or unsubstituted C₅-C₃₀ carbocyclic group or a substituted or unsubstituted C₁-C₃₀ heterocyclic group formed by optionally linking one selected from R₅ and R₆ and one selected from R₂ to R₄ may each independently be selected from:

a cyclopentadiene group, a cyclohexane group, a cycloheptane group, an adamantane group, a bicycle-heptane group, a bicycle-octane group, a benzene group, a pyridine group, a pyrimidine group, a pyrazine group, a pyridazine group, a naphthalene group, an anthracene group, a tetracene group, a phenanthrene group, a dihydronaphthalene group, a phenalene group, a benzothiophene group, a benzofuran group, an indene group, an indole group, a benzosilole group, an azabenzothiophene group, an azabenzofuran group, an azaindene group, an azaindole group, and an azabenzosilole group;

a cyclopentadiene group, a cyclohexane group, a cycloheptane group, an adamantane group, a bicycle-heptane group, a bicycle-octane group, a benzene group, a pyridine group, a pyrimidine group, a pyrazine group, a pyridazine group, a naphthalene group, an anthracene group, a tetracene group, a phenanthrene group, a dihydronaphthalene group, a phenalene group, a benzothiophene group, a benzofuran group, an indene group, an indole group, a benzosilole group, an azabenzothiophene group, an azabenzofuran group, an azaindene group, an azaindole group, and an azabenzosilole group, each substituted with at least one R_(10a),

but embodiments of the present disclosure are not limited thereto.

R_(10a) may be the same as described in connection with R₂.

In the present specification, the terms “an azaindole group, an azabenzoborole group, an azabenzophosphole group, an azaindene group, an azabenzosilole group, an azabenzogermole group, an azabenzothiophene group, an azabenzoselenophene group, an azabenzofuran group, an azacarbazole group, an azadibenzoborole group, an azadibenzophosphole group, an azafluorene group, an azadibenzosilole group, an azadibenzogermole group, an azadibenzothiophene group, an azadibenzoselenophene group, an azadibenzofuran group, an azadibenzothiophene 5-oxide group, an aza-9H-fluorene-9-one group, and an azadibenzothiophene 5,5-dioxide group” as used herein each refer to a heterocyclic group having the same backbone as that of “an indole group, a benzoborole group, a benzophosphole group, an indene group, a benzosilole group, a benzogermole group, a benzothiophene group, a benzoselenophene group, a benzofuran group, a carbazole group, a dibenzoborole group, a dibenzophosphole group, a fluorene group, a dibenzosilole group, a dibenzogermole group, a dibenzothiophene group, a dibenzoselenophene group, a dibenzofuran group, a dibenzothiophene 5-oxide group, a 9H-fluorene-9-one group, and a dibenzothiophene 5,5-dioxide group” in which at least one of carbon atoms forming the heterocyclic group is substituted with nitrogen.

The organometallic compound may be selected from Compounds 1 to 15, but embodiments of the present disclosure are not limited thereto:

In Compounds 1 to 15, Ph indicates a phenyl group.

In Formula 1, a bond between X₁ and M may be a coordinate bond, two bonds selected from a bond between X₂ and M, a bond between X₃ and M, and a bond between X₄ and M may each independently be a covalent bond while the remaining one bond may be a coordinate bond. In this regard, the organometallic compound may become eclectically neutral, resulting in high molecular stability and thermal stability.

In Formula 1, i) when n is 0, CY₁ may be a group represented by one selected from Formulae A1-1 to A1-6, and ii) when n is 1, CY₁ may be a group represented by one selected from Formulae A11-1 to A11-4. In this regard, a difference between a singlet energy and a triplet energy of the organometallic compound may become relatively large so that most of intermolecular energy of the organometallic compound may be collected at a triplet energy level. Accordingly, an electronic device, for example, an organic light-emitting device, including the organometallic compound may provide an electroluminescence (EL) spectrum having a very stiff wave pattern (for example, a wave pattern in which the emission intensity of a short-wavelength tail at a distance of about −100 nanometers (nm) to about 0 nm (for example, at a distance of about −50 nm to about 0 nm) from the maximum emission wavelength (i.e., peak emission wavelength) in the EL spectrum is significantly reduced), and thus, an electronic device, for example, an organic light-emitting device, including the organometallic compound may have improved emission efficiency and excellent color purity.

In addition, in Formula 1, X₁ may be N. In Formulae A1-1 to A1-6 and A11-1 to A11-4, when X₁₄ is C(R₁₄) and X₁₁ is C(R₁₅), R₁₄ and R₁₅ may not be linked each other. Accordingly, the organometallic compound may provide, for example, excellent color purity and efficiency for the emission of red light.

For example, some of the compounds above may be evaluated in terms of highest occupied molecular orbital (HOMO), lowest unoccupied molecular orbital (LUMO), energy band gap (E_(g)), singlet (S₁), and triplet (T₁) energy levels that are calculated by using a density functional theory (DFT) of Gaussian program (that is structurally optimized at a level of B3LYP, 6-31G(d,p)), and results thereof are shown in Table 1 below:

TABLE 1 Compound HOMO LUMO E_(g) S₁ energy T₁ energy No. (eV) (eV) (eV) level (eV) level (eV)  1 −4.390 −1.628 2.762 2.146 1.878  2 −4.409 −1.683 2.726 2.150 1.891  3 −4.616 −1.963 — — 1.878  4 −4.298 −1.480 — — 1.976  5 −4.351 −1.750 — — 1.916  6 −4.547 −1.770 2.777 2.165 1.900  7 −4.884 −2.011 — — — 13 −4.801 −2.115 — — 1.944 14 −4.707 −1.976 — — 1.989 15 −4.681 −2.041 — — 1.909

Referring to Table 1, it is confirmed that the organometallic compound represented by Formula 1 may have such electric characteristics that are suitable for use in an electric device, for example, for use as a dopant for an organic light-emitting device.

Synthesis methods of the organometallic compound represented by Formula 1 may be recognizable by one of ordinary skill in the art by referring to Synthesis Examples provided below.

The organometallic compound represented by Formula 1 is suitable for use in an organic layer of an organic light-emitting device, for example, for use as a dopant in an emission layer of the organic layer. Thus, another aspect provides an organic light-emitting device that includes:

a first electrode;

a second electrode; and

an organic layer that is disposed between the first electrode and the second electrode,

wherein the organic layer includes an emission layer and at least one organometallic compounds represented by Formula 1.

The organic light-emitting device may have, due to the inclusion of an organic layer including the organometallic compound represented by Formula 1, a low driving voltage, high emission efficiency, high power, high quantum emission efficiency, a long lifespan, a low roll-off ratio, and excellent color purity.

The organometallic compound of Formula 1 may be used between a pair of electrodes of an organic light-emitting device. For example, the organometallic compound represented by Formula 1 may be included in the emission layer. In this embodiment, the organometallic compound may act as a dopant, and the emission layer may further include a host (that is, an amount of the organometallic compound represented by Formula 1 is smaller than an amount of the host).

The expression “(an organic layer) includes at least one organometallic compounds” as used herein may include an embodiment in which “(an organic layer) includes identical organometallic compounds represented by Formula 1” and an embodiment in which “(an organic layer) includes two or more different organometallic compounds represented by Formula 1.”

For example, the organic layer may include, as the organometallic compound, only Compound 1. In this embodiment, Compound 1 may be included in an emission layer of the organic light-emitting device. In one or more embodiments, the organic layer may include, as the organometallic compound, Compound 1 and Compound 2. In this embodiment, Compound 1 and Compound 2 may be included in an identical layer (for example, Compound 1 and Compound 2 may both be included in an emission layer).

The first electrode may be an anode, which is a hole injection electrode, and the second electrode may be a cathode, which is an electron injection electrode; or the first electrode may be a cathode, which is an electron injection electrode, and the second electrode may be an anode, which is a hole injection electrode.

In an embodiment, in the organic light-emitting device, the first electrode may be an anode, and the second electrode may be a cathode, and the organic layer may further include a hole transport region disposed between the first electrode and the emission layer and an electron transport region disposed between the emission layer and the second electrode, wherein the hole transport region may include a hole injection layer, a hole transport layer, an electron blocking layer, a buffer layer or any combination thereof, and the electron transport region may include a hole blocking layer, an electron transport layer, an electron injection layer, or any combination thereof.

The term “organic layer” as used herein refers to a single layer and/or a plurality of layers between the first electrode and the second electrode of the organic light-emitting device. The “organic layer” may include, in addition to an organic compound, an organometallic complex including metal.

FIG. 1 is a schematic view of an organic light-emitting device 10 according to an embodiment. Hereinafter, the structure of an organic light-emitting device according to an embodiment and a method of manufacturing an organic light-emitting device according to an embodiment will be described in connection with FIG. 1. The organic light-emitting device 10 includes a first electrode 11, an organic layer 15, and a second electrode 19, which are sequentially stacked.

A substrate may be additionally disposed under the first electrode 11 or above the second electrode 19. For use as the substrate, any substrate that is used in general organic light-emitting devices may be used, and the substrate may be a glass substrate or a transparent plastic substrate, each having excellent mechanical strength, thermal stability, transparency, surface smoothness, ease of handling, and water resistance.

The first electrode 11 may be formed by depositing or sputtering a material for forming the first electrode 11 on the substrate. The first electrode 11 may be an anode. The material for forming the first electrode 11 may be selected from materials with a high work function to facilitate hole injection. The first electrode 11 may be a reflective electrode, a semi-transmissive electrode, or a transmissive electrode. The material for forming the first electrode may be, for example, indium tin oxide (ITO), indium zinc oxide (IZO), tin oxide (SnO₂), and zinc oxide (ZnO). In one or more embodiments, magnesium (Mg), aluminum (Al), aluminum-lithium (Al—Li), calcium (Ca), magnesium-indium (Mg—In), or magnesium-silver (Mg—Ag) may be used as the material for forming the first electrode.

The first electrode 11 may have a single-layered structure or a multi-layered structure including two or more layers. For example, the first electrode 11 may have a three-layered structure of ITO/Ag/ITO, but the structure of the first electrode 11 is not limited thereto.

The organic layer 15 is disposed on the first electrode 11.

The organic layer 15 may include a hole transport region, an emission layer, and an electron transport region.

The hole transport region may be disposed between the first electrode 11 and the emission layer.

The hole transport region may include a hole injection layer, a hole transport layer, an electron blocking layer, a buffer layer, or any combination thereof.

The hole transport region may include only either a hole injection layer or a hole transport layer. In one or more embodiments, the hole transport region may have a hole injection layer/hole transport layer structure or a hole injection layer/hole transport layer/electron blocking layer structure, which are sequentially stacked in this stated order from the first electrode 11.

A hole injection layer may be formed on the first electrode 11 by using one or more suitable methods selected from vacuum deposition, spin coating, casting, or Langmuir-Blodgett (LB) deposition.

When a hole injection layer is formed by vacuum deposition, the deposition conditions may vary according to a compound that is used to form the hole injection layer, and the structure and thermal characteristics of the hole injection layer. For example, the deposition conditions may include a deposition temperature of about 100 to about 500° C., a vacuum pressure of about 10⁻⁸ to about 10⁻³ torr, and a deposition rate of about 0.01 Angstroms per second (Å/sec) to about 100 □/sec. However, the deposition conditions are not limited thereto.

When the hole injection layer is formed using spin coating, coating conditions may vary according to the material used to form the hole injection layer, and the structure and thermal properties of the hole injection layer. For example, a coating speed may be from about 2,000 revolutions per minute (rpm) to about 5,000 rpm, and a temperature at which a heat treatment is performed to remove a solvent after coating may be from about 80° C. to about 200° C. However, the coating conditions are not limited thereto.

Conditions for forming a hole transport layer and an electron blocking layer may be understood by referring to conditions for forming the hole injection layer.

The hole transport region may include at least one selected from m-MTDATA, TDATA, 2-TNATA, NPB, R-NPB, TPD, Spiro-TPD, Spiro-NPB, methylated-NPB, TAPC, HMTPD, 4,4′,4″-tris(N-carbazolyl)triphenylamine (TCTA), polyaniline/dodecylbenzene sulfonic acid (PANI/DBSA), poly(3,4-ethylenedioxythiophene)/poly(4-styrene sulfonate) (PEDOT/PSS), polyaniline/camphor sulfonic acid (PANI/CSA), polyaniline/poly(4-styrene sulfonate) (PANI/PSS), a compound represented by Formula 201, and a compound represented by Formula 202:

In Formula 201, Ar₁₀₁ and Ar₁₀₂ may each independently be selected from: a phenylene group, a pentalenylene group, an indenylene group, a naphthylene group, an azulenylene group, a heptalenylene group, an acenaphthylene group, a fluorenylene group, a phenalenylene group, a phenanthrenylene group, an anthracenylene group, a fluoranthenylene group, a triphenylenylene group, a pyrenylene group, a chrysenylenylene group, a naphthacenylene group, a picenylene group, a perylenylene group, and a pentacenylene group; and

a phenylene group, a pentalenylene group, an indenylene group, a naphthylene group, an azulenylene group, a heptalenylene group, an acenaphthylene group, a fluorenylene group, a phenalenylene group, a phenanthrenylene group, an anthracenylene group, a fluoranthenylene group, a triphenylenylene group, a pyrenylene group, a chrysenylenylene group, a naphthacenylene group, a picenylene group, a perylenylene group, and a pentacenylene group, each substituted with at least one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀ cycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₇-C₆₀ aryl alkyl group, a C₁-C₆₀ heteroaryl group, a C₁-C₆₀ heteroaryloxy group, a C₁-C₆₀ heteroarylthio group, a C₂-C₆₀ heteroaryl alkyl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group.

In Formula 201, xa and xb may each independently be an integer from 0 to 5, or may each independently be 0, 1, or 2. For example, xa is 1 and xb is 0, but xa and xb are not limited thereto.

In Formulae 201 and 202, R₁₀₁ to R₁₀₈, R₁₁₁ to R₁₁₉, and R₁₂₁ to R₁₂₄ may each independently be selected from:

hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₁₀ alkyl group (for example, a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, and so on), or a C₁-C₁₀ alkoxy group (for example, a methoxy group, an ethoxy group, a propoxy group, a butoxy group, a pentoxy group, and so on);

a C₁-C₁₀ alkyl group or a C₁-C₁₀ alkoxy group, each substituted with at least one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, and a phosphoric acid group or a salt thereof;

a phenyl group, a naphthyl group, an anthracenyl group, a fluorenyl group, and a pyrenyl group; and

a phenyl group, a naphthyl group, an anthracenyl group, a fluorenyl group, and a pyrenyl group, each substituted with at least one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₁₀ alkyl group, and a C₁-C₁₀ alkoxy group,

but embodiments of the present disclosure are not limited thereto.

In Formula 201, R₁₀₉ may be selected from:

a phenyl group, a naphthyl group, an anthracenyl group, and a pyridinyl group; and

a phenyl group, a naphthyl group, an anthracenyl group, and a pyridinyl group, each substituted with at least one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a phenyl group, a naphthyl group, an anthracenyl group, and a pyridinyl group.

According to an embodiment, the compound represented by Formula 201 may be represented by Formula 201A, but embodiments of the present disclosure are not limited thereto:

In Formula 201A, R₁₀₁, R₁₁₁, R₁₁₂, and R₁₀₉ may respectively be the same as described above.

For example, the compound represented by Formula 201, and the compound represented by Formula 202 may include compounds HT1 to HT20, but are not limited thereto:

A thickness of the hole transport region may be in a range of about 100 Angstroms (Å) to about 10,000 Å, for example, about 100 Å to about 1,000 Å. When the hole transport region includes at least one of a hole injection layer and a hole transport layer, the thickness of the hole injection layer may be in a range of about 100 Å to about 10,000 Å, and for example, about 100 Å to about 1,000 Å, and the thickness of the hole transport layer may be in a range of about 50 Å to about 2,000 Å, and for example, about 100 Å to about 1500 Å. While not wishing to be bound by theory, it is understood that when the thicknesses of the hole transport region, the hole injection layer, and the hole transport layer are within these ranges, satisfactory hole transporting characteristics may be obtained without a substantial increase in driving voltage.

The hole transport region may further include, in addition to these materials, a charge-generation material for the improvement of conductive properties. The charge-generation material may be homogeneously or non-homogeneously dispersed in the hole transport region.

The charge-generation material may be, for example, a p-dopant. The p-dopant may be one selected from a quinone derivative, a metal oxide, and a cyano group-containing compound, but embodiments of the present disclosure are not limited thereto. Non-limiting examples of the p-dopant are a quinone derivative, such as tetracyanoquinonedimethane (TCNQ) or 2,3,5,6-tetrafluoro-tetracyano-1,4-benzoquinonedimethane (F4-TCNQ); a metal oxide, such as a tungsten oxide or a molybdenum oxide; and a cyano group-containing compound, such as Compound HT-D1 below, but are not limited thereto:

The hole transport region may include a buffer layer.

Also, the buffer layer may compensate for an optical resonance distance according to a wavelength of light emitted from the emission layer, and thus, efficiency of a formed organic light-emitting device may be improved.

Then, an emission layer may be formed on the hole transport region by vacuum deposition, spin coating, casting, LB deposition, or the like. When the emission layer is formed by vacuum deposition or spin coating, the deposition or coating conditions may be similar to those applied in forming the hole injection layer although the deposition or coating conditions may vary according to a compound that is used to form the emission layer.

Meanwhile, when the hole transport region includes an electron blocking layer, a material for the electron blocking layer may be selected from materials for the hole transport region described above and materials for a host to be explained later. However, the material for the electron blocking layer is not limited thereto. For example, when the hole transport region includes an electron blocking layer, a material for the electron blocking layer may be mCP, which will be explained later.

The emission layer may include a host and a dopant, and the dopant may include the organometallic compound represented by Formula 1.

The host may include at least one selected from TPBi, TBADN, ADN (also referred to as “DNA”), CBP, CDBP, TCP, mCP, Compound H50, and Compound H51:

In one or more embodiments, the host may further include a compound represented by Formula 301:

In Formula 301, Ar₁₁₁ and Ar₁₁₂ may each independently be selected from:

a phenylene group, a naphthylene group, a phenanthrenylene group, and a pyrenylene group; and

a phenylene group, a naphthylene group, a phenanthrenylene group, and a pyrenylene group, each substituted with at least one selected from a phenyl group, a naphthyl group, and an anthracenyl group.

In Formula 301, Ar₁₁₃ to Ar₁₁₆ may each independently be selected from:

a C₁-C₁₀ alkyl group, a phenyl group, a naphthyl group, a phenanthrenyl group, and a pyrenyl group; and

a phenyl group, a naphthyl group, a phenanthrenyl group, and a pyrenyl group, each substituted with at least one selected from a phenyl group, a naphthyl group, and an anthracenyl group.

In Formula 301, g, h, i, and j may each independently be an integer from 0 to 4, and may be, for example, 0, 1, or 2.

In Formula 301, Ar₁₁₃ to Ar₁₁₆ may each independently be selected from:

a C₁-C₁₀ alkyl group substituted with at least one selected from a phenyl group, a naphthyl group, and an anthracenyl group;

a phenyl group, a naphthyl group, an anthracenyl group, a pyrenyl, a phenanthrenyl group, and a fluorenyl group;

a phenyl group, a naphthyl group, an anthracenyl group, a pyrenyl group, a phenanthrenyl group, and a fluorenyl group, each substituted with at least one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a phenyl group, a naphthyl group, an anthracenyl group, a pyrenyl group, a phenanthrenyl group, and a fluorenyl group; and

but embodiments of the present disclosure are not limited thereto.

In one or more embodiments, the host may include a compound represented by Formula 302:

In Formula 301, Ar₁₂₂ to Ar₁₂₅ may respectively be the same as described in connection with Ar₁₁₃ in Formula 301.

In Formula 302, Ar₁₂₆ and Ar₁₂₇ may each independently be a C₁-C₁₀ alkyl group (for example, a methyl group, an ethyl group, or a propyl group).

In Formula 301, k and l may each independently be an integer from 0 to 4. For example, k and l may be 0, 1, or 2.

When the organic light-emitting device is a full-color organic light-emitting device, the emission layer may be patterned into a red emission layer, a green emission layer, and a blue emission layer. In one or more embodiments, due to a stacked structure including a red emission layer, a green emission layer, and/or a blue emission layer, the emission layer may emit white light.

When the emission layer includes a host and a dopant, an amount of the dopant may be in a range of about 0.01 parts to about 15 parts by weight based on 100 parts by weight of the host, but embodiments of the present disclosure are not limited thereto.

A thickness of the emission layer may be in a range of about 100 Å to about 1,000 Å, for example, about 200 Å to about 600 Å. While not wishing to be bound by theory, it is understood that when the thickness of the emission layer is within this range, excellent light-emission characteristics may be obtained without a substantial increase in driving voltage.

Then, an electron transport region may be disposed on the emission layer.

The electron transport region may include a hole blocking layer, an electron transport layer, an electron injection layer, or any combination thereof.

For example, the electron transport region may have a hole blocking layer/electron transport layer/electron injection layer structure or an electron transport layer/electron injection layer structure, but the structure of the electron transport region is not limited thereto. The electron transport layer may have a single-layered structure or a multi-layered structure including two or more different materials.

Conditions for forming the hole blocking layer, the electron transport layer, and the electron injection layer which constitute the electron transport region may be understood by referring to the conditions for forming the hole injection layer.

When the electron transport region includes a hole blocking layer, the hole blocking layer may include, for example, at least one of BCP, Bphen, and BAlq but embodiments of the present disclosure are not limited thereto:

A thickness of the hole blocking layer may be in a range of about 20 Å to about 1,000 Å, for example, about 30 Å to about 300 Å. While not wishing to be bound by theory, it is understood that when the thickness of the hole blocking layer is within these ranges, the hole blocking layer may have improved hole blocking ability without a substantial increase in driving voltage.

The electron transport layer may further include at least one selected from BCP, Bphen, Alq₃, BAlq, TAZ, and NTAZ:

In one or more embodiments, the electron transport layer may include at least one of ET1 to ET25, but are not limited thereto:

A thickness of the electron transport layer may be in a range of about 100 Å to about 1,000 Å, for example, about 150 Å to about 500 Å. While not wishing to be bound by theory, it is understood that when the thickness of the electron transport layer is within the range described above, the electron transport layer may have satisfactory electron transport characteristics without a substantial increase in driving voltage.

Also, the electron transport layer may further include, in addition to the materials described above, a metal-containing material.

The metal-containing material may include a Li complex. The Li complex may include, for example, Compound ET-D1 (lithium 8-hydroxyquinolate, LiQ) or ET-D2:

The electron transport region may include an electron injection layer that promotes flow of electrons from the second electrode 19 thereinto.

The electron injection layer may include at least one selected from LiF, NaCl, CsF, Li₂O, and BaO.

A thickness of the electron injection layer may be in a range of about 1 Å to about 100 Å, for example, about 3 Å to about 90 Å. While not wishing to be bound by theory, it is understood that when the thickness of the electron injection layer is within the range described above, the electron injection layer may have satisfactory electron injection characteristics without a substantial increase in driving voltage.

The second electrode 19 is disposed on the organic layer 15. The second electrode 19 may be a cathode. A material for forming the second electrode 19 may be selected from metal, an alloy, an electrically conductive compound, and a combination thereof, which have a relatively low work function. For example, lithium (Li), magnesium (Mg), aluminum (Al), aluminum-lithium (Al—Li), calcium (Ca), magnesium-indium (Mg—In), or magnesium-silver (Mg—Ag) may be used as a material for forming the second electrode 19. In one or more embodiments, to manufacture a top-emission type light-emitting device, a transmissive electrode formed using ITO or IZO may be used as the second electrode 19.

Hereinbefore, the organic light-emitting device has been described with reference to FIG. 1, but embodiments of the present disclosure are not limited thereto.

Another aspect of the present disclosure provides a diagnostic composition including at least one organometallic compound represented by Formula 1.

The organometallic compound represented by Formula 1 provides high luminescent efficiency. Accordingly, a diagnostic composition including the organometallic compound may have high diagnostic efficiency.

The diagnostic composition may be used in various applications including a diagnosis kit, a diagnosis reagent, a biosensor, and a biomarker.

The term “C₁-C₆₀ alkyl group” as used herein refers to a linear or branched saturated aliphatic hydrocarbon monovalent group having 1 to 60 carbon atoms, and non-limiting examples thereof include a methyl group, an ethyl group, a propyl group, an iso-butyl group, a sec-butyl group, a tert-butyl group, a pentyl group, an iso-amyl group, and a hexyl group. The term “C₁-C₆₀ alkylene group” as used herein refers to a divalent group having the same structure as the C₁-C₆₀ alkyl group.

The term “C₁-C₆₀ alkoxy group” as used herein refers to a monovalent group represented by —OA₁₀₁ (wherein A₁₀₁ is the C₁-C₆₀ alkyl group), and non-limiting examples thereof include a methoxy group, an ethoxy group, and an iso-propyloxy group.

The term “C₂-C₆₀ alkenyl group” as used herein refers to a hydrocarbon group formed by including at least one carbon-carbon double bond in the middle or at the terminus of the C₂-C₆₀ alkyl group, and examples thereof include an ethenyl group, a propenyl group, and a butenyl group. The term “C₂-C₆₀ alkenylene group” as used herein refers to a divalent group having the same structure as the C₂-C₆₀ alkenyl group.

The term “C₂-C₆₀ alkynyl group” as used herein refers to a hydrocarbon group formed by including at least one carbon-carbon triple bond in the middle or at the terminus of the C₂-C₆₀ alkyl group, and examples thereof include an ethynyl group, and a propynyl group. The term “C₂-C₆₀ alkynylene group” as used herein refers to a divalent group having the same structure as the C₂-C₆₀ alkynyl group.

The term “C₃-C₁₀ cycloalkyl group” as used herein refers to a monovalent saturated hydrocarbon monocyclic group having 3 to 10 carbon atoms, and non-limiting examples thereof include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, and a cycloheptyl group. The term “C₃-C₁₀ cycloalkylene group” as used herein refers to a divalent group having the same structure as the C₃-C₁₀ cycloalkyl group.

The term “C₁-C₁₀ heterocycloalkyl group” as used herein refers to a monovalent saturated monocyclic group having at least one heteroatom selected from N, O, P, Si and S as a ring-forming atom and 1 to 10 carbon atoms, and non-limiting examples thereof include a tetrahydrofuranyl group, and a tetrahydrothiophenyl group. The term “C₁-C₁₀ heterocycloalkylene group” as used herein refers to a divalent group having the same structure as the C₁-C₁₀ heterocycloalkyl group.

The term “C₃-C₁₀ cycloalkenyl group” as used herein refers to a monovalent monocyclic group that has 3 to 10 carbon atoms and at least one carbon-carbon double bond in the ring thereof and no aromaticity, and non-limiting examples thereof include a cyclopentenyl group, a cyclohexenyl group, and a cycloheptenyl group. The term “C₃-C₁₀ cycloalkenylene group” as used herein refers to a divalent group having the same structure as the C₃-C₁₀ cycloalkenyl group.

The term “C₁-C₁₀ heterocycloalkenyl group” as used herein refers to a monovalent monocyclic group that has at least one heteroatom selected from N, O, P, Si, and S as a ring-forming atom, 1 to 10 carbon atoms, and at least one double bond in its ring. Examples of the C₁-C₁₀ heterocycloalkenyl group are a 2,3-dihydrofuranyl group, and a 2,3-dihydrothiophenyl group. The term “C₁-C₁₀ heterocycloalkenylene group” as used herein refers to a divalent group having the same structure as the C₁-C₁₀ heterocycloalkenyl group.

The term “C₆-C₆₀ aryl group” as used herein refers to a monovalent group having a carbocyclic aromatic system having 6 to 60 carbon atoms, and the term “C₆-C₆₀ arylene group” as used herein refers to a divalent group having a carbocyclic aromatic system having 6 to 60 carbon atoms. Non-limiting examples of the C₆-C₆₀ aryl group include a phenyl group, a naphthyl group, an anthracenyl group, a phenanthrenyl group, a pyrenyl group, and a chrysenyl group. When the C₆-C₆₀ aryl group and the C₆-C₆₀ arylene group each include two or more rings, the rings may be fused to each other.

The term “C₁-C₆₀ heteroaryl group” as used herein refers to a monovalent group having a heterocyclic aromatic system that has at least one heteroatom selected from N, O, P, Si, and S as a ring-forming atom, and 1 to 60 carbon atoms. The term “C₁-C₆₀ heteroarylene group” as used herein refers to a divalent group having a heterocyclic aromatic system that has at least one heteroatom selected from N, O, P, Si, and S as a ring-forming atom, and 1 to 60 carbon atoms. Non-limiting examples of the C₁-C₆₀ heteroaryl group include a pyridinyl group, a pyrimidinyl group, a pyrazinyl group, a pyridazinyl group, a triazinyl group, a quinolinyl group, and an isoquinolinyl group. When the C₁-C₆₀ heteroaryl group and the C₁-C₆₀ heteroarylene group each include two or more rings, the rings may be fused to each other.

The term “C₆-C₆₀ aryloxy group” as used herein indicates —OA₁₀₂ (wherein A₁₀₂ is the C₆-C₆₀ aryl group), the term “C₆-C₆₀ arylthio group” as used herein indicates —SA₁₀₃ (wherein A₁₀₃ is the C₆-C₆₀ aryl group), and the term “C₇-C₆₀ arylalkyl group” as used herein indicates -A₁₀₄A₁₀₅ (wherein A₁₀₅ is the C₆-C₅₉ aryl group and A₁₀₄ is the C₁-C₅₃ alkylene group).

The term “C₁-C₆₀ heteroaryloxy group” as used herein refers to —OA₁₀₆ (wherein A₁₀₆ is the C₂-C₆₀ heteroaryl group), the term “C₁-C₆₀ heteroarylthio group” as used herein indicates —SA₁₀₇ (wherein A₁₀₇ is the C₁-C₆₀ heteroaryl group), and the term “C₂-C₆₀ heteroarylalkyl group” as used herein refers to -A₁₀₈A₁₀₉ (A₁₀₉ is a C₁-C₅₉ heteroaryl group, and A₁₀₈ is a C₁-C₅₉ alkylene group).

The term “monovalent non-aromatic condensed polycyclic group” as used herein refers to a monovalent group (for example, having 8 to 60 carbon atoms) having two or more rings condensed to each other, only carbon atoms as ring-forming atoms, and no aromaticity in its entire molecular structure. Examples of the monovalent non-aromatic condensed polycyclic group include a fluorenyl group. The term “divalent non-aromatic condensed polycyclic group” as used herein refers to a divalent group having the same structure as the monovalent non-aromatic condensed polycyclic group.

The term “monovalent non-aromatic condensed heteropolycyclic group” as used herein refers to a monovalent group (for example, having 2 to 60 carbon atoms) having two or more rings condensed to each other, a heteroatom selected from N, O, P, Si, and S, other than carbon atoms, as a ring-forming atom, and no aromaticity in its entire molecular structure. Non-limiting examples of the monovalent non-aromatic condensed heteropolycyclic group include a carbazolyl group. The term “divalent non-aromatic condensed heteropolycyclic group” as used herein refers to a divalent group having the same structure as the monovalent non-aromatic condensed heteropolycyclic group.

The term “C₇-C₆₀ alkyl aryl group and the C₂-C₆₀ alkyl heteroaryl group” as used herein refers respectively a C₆-C₆₀ aryl group and a C₁-C₆₀ heteroaryl group, each substituted with at least one C₁-C₆₀ alkyl group.

The term “C₅-C₃₀ carbocyclic group” as used herein refers to a saturated or unsaturated cyclic group having, as a ring-forming atom, 5 to 30 carbon atoms only. The C₅-C₃₀ carbocyclic group may be a monocyclic group or a polycyclic group.

The term “C₁-C₃₀ heterocyclic group” as used herein refers to a saturated or unsaturated cyclic group having, as a ring-forming atom, at least one heteroatom selected from N, O, Si, P, and S other than 1 to 30 carbon atoms. The C₁-C₃₀ heterocyclic group may be a monocyclic group or a polycyclic group.

At least one substituent of the substituted C₅-C₃₀ carbocyclic group, the substituted C₂-C₃₀ heterocyclic group, the substituted C₁-C₆₀ alkyl group, the substituted C₂-C₆₀ alkenyl group, the substituted C₂-C₆₀ alkynyl group, the substituted C₁-C₆₀ alkoxy group, the substituted C₃-C₁₀ cycloalkyl group, the substituted C₁-C₀ heterocycloalkyl group, the substituted C₃-C₁₀ cycloalkenyl group, the substituted C₁-C₁₀ heterocycloalkenyl group, the substituted C₆-C₆₀ aryl group, the substituted C₇-C₆₀ alkyl aryl group, the substituted C₆-C₆₀ aryloxy group, the substituted C₆-C₆₀ arylthio group, the substituted C₇-C₆₀ aryl alkyl group, the substituted C₁-C₆₀ heteroaryl group, the substituted C₇-C₆₀ alkyl heteroaryl group, the substituted C₁-C₆₀ heteroaryloxy group, the substituted C₁-C₆₀ heteroarylthio group, the C₂-C₆₀ heteroaryl alkyl group, the substituted monovalent non-aromatic condensed polycyclic group, and the substituted monovalent non-aromatic condensed heteropolycyclic group may be selected from:

deuterium, —F, —Cl, —Br, —I, —CD₃, —CD₂H, —CDH₂, —CF₃, —CF₂H, —CFH₂, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, and a C₁-C₆₀ alkoxy group;

a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, and a C₁-C₆₀ alkoxy group, each substituted with at least one selected from deuterium, —F, —Cl, —Br, —I, —CD₃, —CD₂H, —CDH₂, —CF₃, —CF₂H, —CFH₂, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₇-C₆₀ alkyl aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₇-C₆₀ aryl alkyl group, a C₁-C₆₀ heteroaryl group, a C₇-C₆₀ alkyl heteroaryl group, a C₁-C₆₀ heteroaryloxy group, a C₁-C₆₀ heteroarylthio group, a C₂-C₆₀ heteroaryl alkyl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, —N(Q₁₁)(Q₁₂), —Si(Q₁₃)(Q₁₄)(Q₁₅), —B(Q₁₆)(Q₁₇), and —P(═O)(Q₁₈)(Q₁₉),

a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₇-C₆₀ alkyl aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₇-C₆₀ aryl alkyl group, a C₁-C₆₀ heteroaryl group, a C₇-C₆₀ alkyl heteroaryl group, a C₁-C₆₀ heteroaryloxy group, a C₁-C₆₀ heteroarylthio group, a C₂-C₆₀ heteroaryl alkyl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group;

a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₇-C₆₀ alkyl aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₇-C₆₀ aryl alkyl group, a C₁-C₆₀ heteroaryl group, a C₇-C₆₀ alkyl heteroaryl group, a C₁-C₆₀ heteroaryloxy group, a C₁-C₆₀ heteroarylthio group, a C₂-C₆₀ heteroaryl alkyl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group, each substituted with at least one selected from deuterium, —F, —Cl, —Br, —I, —CD₃, —CD₂H, —CDH₂, —CF₃, —CF₂H, —CFH₂, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₇-C₆₀ alkyl aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₇-C₆₀ aryl alkyl group, a C₁-C₆₀ heteroaryl group, a C₇-C₆₀ alkyl heteroaryl group, a C₁-C₆₀ heteroaryloxy group, a C₁-C₆₀ heteroarylthio group, a C₂-C₆₀ heteroaryl alkyl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, —N(Q₂₁)(Q₂₂), —Si(Q₂₃)(Q₂₄)(Q₂₅), —B(Q₂₆)(Q₂₇), and —P(═O)(Q₂₈)(Q₂₉); and

—N(Q₃₁)(Q₃₂), —Si(Q₃₃)(Q₃₄)(Q₃₅), —B(Q₃₆)(Q₃₇), and —P(═O)(Q₃₈)(Q₃₉), and

Q₁ to Q₉, Q₁₁ to Q₁₉, Q₂₁ to Q₂₉, and Q₃₁ to Q₃₉ may each independently be selected from hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryl group substituted with at least one selected from a C₁-C₆₀ alkyl group, and a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₇-C₆₀ aryl alkyl group, a C₁-C₆₀ heteroaryl group, a C₁-C₆₀ heteroaryloxy group, a C₁-C₆₀ heteroarylthio group, a C₂-C₆₀ heteroaryl alkyl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group.

Hereinafter, a compound and an organic light-emitting device according to embodiments are described in detail with reference to Synthesis Example and Examples. However, the organic light-emitting device is not limited thereto. The expression “B was used instead of A” used in describing Synthesis Examples means that an identical number of molar equivalents of ‘B’ was used in place of molar equivalents of ‘A’.

EXAMPLES Synthesis Example 1: Synthesis of Compound 1

1) Synthesis of Intermediate I-1-2

10.0 grams (g) (49.8 millimoles, mmol) of 3-bromophenylboronic acid, 80 milliliters (ml) of toluene, and 15 ml of ethanol were added to a reactor, and then, 12.5 g (41.5 mmol) of 4-bromo-2-(2,6-dimethylphenyl)furo[3,2-c]pyridine, 3.3 g (2.90 mmol) of Pd(PPh₃)₄, and 15 ml of 2.0 molar (M) sodium carbonate solution were added thereto. The mixture was then heated and stirred under reflux at a temperature of 110° C. for 18 hours. When the reaction was completed, the resulting mixture was concentrated under reduced pressure, dissolved in 100 ml of dichloromethane, and filtered using diatomite. The organic layer obtained therefrom was dried by using magnesium sulfate to be distilled under reduced pressure, and purified by liquid chromatography to obtain 11.8 g (31 mmol, yield: 75%) of Intermediate I-1-2.

LC-MS m/z=378 (M+H)⁺

2) Synthesis of Intermediate I-1-1

10.0 g (27.6 mmol) of Intermediate I-1-2 and 100 ml of toluene were added to a reactor, and then, 2.0 g (12.0 mmol) of 2-aminobiphenyl, 1.0 g (1.8 mmol) of Pd(dba)₂, and 0.8 g (3.6 mmol) of P(^(t)Bu)₃, and 3.5 g (36 mmol) of sodium butoxide were added thereto. The mixture was then heated and stirred under reflux at a temperature of 120° C. for 24 hours. When the reaction was completed, the resulting mixture was concentrated under reduced pressure, dissolved in dichloromethane, and filtered using diatomite. The organic layer obtained therefrom was dried by using magnesium sulfate to be distilled under reduced pressure, and purified by liquid chromatography to obtain 6.4 g (8.4 mmol, yield: 70%) of Intermediate I-1-1.

LC-MS m/z=764 (M+H)⁺

3) Synthesis of Compound 1

At a temperature of 25° C., 1.5 g (1.96 mmol) of Intermediate I-1-1 was added to 60 ml of benzonitrile. 0.92 g (1.96 mmol) of PtCl₂(NCPh)₂ was added thereto, and the reaction solution was heated at a temperature of 150° C. for 18 hours. When the reaction was completed, the resulting mixture was concentrated under reduced pressure and purified by liquid chromatography to obtain 0.8 g (0.9 mmol, yield: 45%) of Compound 1. The compound obtained therefrom was confirmed by LCMS.

LC-MS m/z=957 (M+H)⁺

Synthesis Example 2: Synthesis of Compound 2

1) Synthesis of Intermediate I-2-2

Intermediate I-2-2 (yield: 76%) was synthesized in the same manner as in Synthesis Example 1 for synthesizing Intermediate I-1-2, except that 2-(5-bromo-[1,1′-biphenyl]-3-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane was used instead of 3-bromophenylboronic acid. The compound obtained therefrom was confirmed by LC-MS.

LC-MS m/z=454 (M+H)⁺

2) Synthesis of Intermediate I-2-1

Intermediate I-2-1 (yield: 70%) was synthesized in the same manner as in Synthesis Example 1 for synthesizing Intermediate I-1-1, except that Intermediate I-2-2 was used instead of Intermediate I-1-2. The compound obtained therefrom was confirmed by LC-MS.

LC-MS m/z=916 (M+H)⁺

3) Synthesis of Compound 2

Compound 2 was synthesized in the same manner as in Synthesis Example 1 for synthesizing Compound 1, except that Intermediate I-2-1 was used instead of Intermediate I-1-1. The compound obtained therefrom was confirmed by LC-MS.

LC-MS m/z=1109 (M+H)⁺

Synthesis Example 3: Synthesis of Compound 3

1) Synthesis of Intermediate I-3-2

Intermediate I-3-2 (yield: 70%) was synthesized in the same manner as in Synthesis Example 2 for synthesizing Intermediate I-2-2, except that 4-bromo-2-phenylfuro[3,2-c]pyridine was used instead of 4-bromo-2-(2,6-dimethylphenyl)furo[3,2-c]pyridine. The compound obtained therefrom was confirmed by LC-MS.

LC-MS m/z=426 (M+H)⁺

2) Synthesis of Intermediate I-3-1

3.0 g (7.0 mmol) of Intermediate I-3-2 and 80 ml of toluene were added to a reactor, and then, 0.4 g (3.3 mmol) of 4,6-dimethylpyrimidin-5-amine, 0.1 g (0.5 mmol) of Pd(dba)₂, 0.2 g (1.0 mmol) of P(^(t)Bu)₃, and 0.95 g (9.9 mmol) of sodium butoxide were added thereto. The mixture was then heated and stirred under reflux at a temperature of 120° C. for 36 hours. When the reaction was completed, the resulting mixture was concentrated under reduced pressure, dissolved in dichloromethane, and filtered using diatomite. The organic layer obtained therefrom was dried by using magnesium sulfate to be distilled under reduced pressure, and purified by liquid chromatography to obtain 1.4 g (1.7 mmol, yield: 53%) of Intermediate I-3-1.

LC-MS m/z=814 (M+H)⁺

3) Synthesis of Compound 3

Compound 3 (yield: 20%) was synthesized in the same manner as in Synthesis Example 1 for synthesizing Compound 1, except that Intermediate I-3-1 was used instead of Intermediate I-1-1. The compound obtained therefrom was confirmed by LCMS.

LC-MS m/z=1007 (M+H)⁺

Synthesis Example 4: Synthesis of Compound 4

1) Synthesis of Intermediate I-4-3

Intermediate I-4-3 (yield: 70%) was synthesized in the same manner as in Synthesis Example 1 for synthesizing Intermediate I-1-2, except that 2-bromo-1-methyl-1H-imidazole was used instead of 4-bromo-2-(2,6-dimethylphenyl)furo[3,2-c]pyridine. The compound obtained therefrom was confirmed by LCMS.

LC-MS m/z=237 (M+H)⁺

2) Synthesis of Intermediate I-4-2

2.0 g (8.4 mmol) of Intermediate I-4-3 and 60 ml of toluene were added to a reactor, and then, 1.5 g (9.0 mmol) of 2-aminobiphenyl, 0.5 g (0.8 mmol) of Pd(dba)₂, 0.3 g (1.6 mmol) of P(^(t)Bu)₃, and 3.6 g (16.8 mmol) of sodium butoxide were added thereto. The mixture was then heated and stirred under reflux at a temperature of 120° C. for 18 hours. When the reaction was completed, the resulting mixture was concentrated under reduced pressure, dissolved in dichloromethane, and filtered using diatomite. The organic layer obtained therefrom was dried by using magnesium sulfate to be distilled under reduced pressure, and purified by liquid chromatography to obtain 2.1 g (6.7 mmol, yield: 85%) of Intermediate I-4-2.

LC-MS m/z=326 (M+H)⁺

3) Synthesis of Intermediate I-4-1

1.0 g (3.1 mmol) of Intermediate I-4-2 and 80 ml of toluene were added to a reactor, and then, 1.4 g (3.1 mmol) of Intermediate I-2-2, 0.17 g (0.3 mmol) of Pd(dba)₂, 0.12 g (0.6 mmol) of P(^(t)Bu)₃, and 0.6 g (6.2 mmol) of sodium butoxide were added thereto. The mixture was then heated and stirred under reflux at a temperature of 120° C. for 16 hours. When the reaction was completed, the resulting mixture was concentrated under reduced pressure, dissolved in dichloromethane, and filtered using diatomite. The organic layer obtained therefrom was dried by using magnesium sulfate to be distilled under reduced pressure, and purified by liquid chromatography to obtain 1.1 g (1.6 mmol, yield: 52%) of Intermediate I-4-1.

LC-MS m/z=699 (M+H)⁺

4) Synthesis of Compound 4

Compound 4 (yield: 50%) was synthesized in the same manner as in Synthesis Example 1 for synthesizing Compound 1, except that Intermediate I-4-1 was used instead of Intermediate I-1-1. The compound obtained therefrom was confirmed by LCMS.

LC-MS m/z=892 (M+H)⁺

Synthesis Example 5: Synthesis of Compound 5

1) Synthesis of Intermediate I-5-4

Intermediate I-5-4 (yield: 60%) was synthesized in the same manner as in Synthesis Example 2 for synthesizing Intermediate I-2-2, except that 2-([1,1′-biphenyl]-4-yl)-4-bromofuro[3,2-c]pyridine was used instead of 4-bromo-2-(2,6-dimethylphenyl)furo[3,2-c]pyridine. The compound obtained therefrom was confirmed by LCMS.

LC-MS m/z=424 (M+H)⁺

2) Synthesis of Intermediate I-5-3

Intermediate I-5-3 (yield: 75%) was synthesized in the same manner as in Synthesis Example 4 for synthesizing Intermediate I-4-3, except that 2-bromo-1-methyl-1H-benzo[d]imidazole was used instead of 2-bromo-1-methyl-1H-imidazole. The compound obtained therefrom was confirmed by LCMS.

LC-MS m/z=287 (M+H)⁺

3) Synthesis of Intermediate I-5-2

Intermediate I-5-2 (yield: 80%) was synthesized in the same manner as in Synthesis Example 4 for synthesizing Intermediate I-4-2, except that Intermediate I-5-3 was used instead of Intermediate I-4-3. The compound obtained therefrom was confirmed by LCMS.

LC-MS m/z=376 (M+H)⁺

3) Synthesis of Intermediate I-5-1

Intermediate I-5-1 (yield: 70%) was synthesized in the same manner as in Synthesis Example 4 for synthesizing Intermediate I-4-1, except that Intermediate I-5-2 and Intermediate I-5-4 were used instead of Intermediate I-4-2 and Intermediate I-2-2, respectively. The compound obtained therefrom was confirmed by LCMS.

LC-MS m/z=747 (M+H)⁺

4) Synthesis of Compound 5

Compound 5 (yield: 40%) was synthesized in the same manner as in Synthesis Example 1 for synthesizing Compound 1, except that Intermediate I-5-1 was used instead of Intermediate I-1-1. The compound obtained therefrom was confirmed by LCMS.

LC-MS m/z=990 (M+H)⁺

Synthesis Example 6: Synthesis of Compound 6

1) Synthesis of Intermediate I-6-2

Intermediate I-6-2 (yield: 70%) was synthesized in the same manner as in Synthesis Example 2 for synthesizing Intermediate I-2-2, except that 4-bromo-2-(2,6-dimethylphenyl)thieno[3,2-c]pyridine was used instead of 4-bromo-2-(2,6-dimethylphenyl)furo[3,2-c]pyridine. The compound obtained therefrom was confirmed by LCMS.

LC-MS m/z=470 (M+H)⁺

2) Synthesis of Intermediate I-6-1

Intermediate I-6-1 (yield: 56%) was synthesized in the same manner as in Synthesis Example 1 for synthesizing Intermediate I-2-21, except that 2,4-dimethylpyridin-3-amine was used instead of 2-aminobiphenyl. The compound obtained therefrom was confirmed by LCMS.

LC-MS m/z=901 (M+H)⁺

3) Synthesis of Compound 6

Compound 6 (yield: 28%) was synthesized in the same manner as in Synthesis Example 1 for synthesizing Compound 1, except that Intermediate I-6-1 was used instead of Intermediate I-1-1. The compound obtained therefrom was confirmed by LCMS.

LC-MS m/z=1094 (M+H)⁺

Synthesis Example 7: Synthesis of Compound 7

1) Synthesis of Intermediate I-7-2

Intermediate I-7-2 (yield: 60%) was synthesized in the same manner as in Synthesis Example 2 for synthesizing Intermediate I-2-2, except that 7-bromo-2-(4-(tert-butyl)phenyl)furo[2,3-c]pyridine was used instead of 4-bromo-2-(2,6-dimethylphenyl)furo[3,2-c]pyridine. The compound obtained therefrom was confirmed by LCMS.

LC-MS m/z=482 (M+H)⁺

2) Synthesis of Intermediate I-7-1

Intermediate I-7-1 (yield: 45%) was synthesized in the same manner as in Synthesis Example 3 for synthesizing Intermediate I-3-1, except that Intermediate I-7-2 was used instead of Intermediate I-3-2. The compound obtained therefrom was confirmed by LCMS.

LC-MS m/z=926 (M+H)⁺

3) Synthesis of Compound 7

Compound 7 (yield: 25%) was synthesized in the same manner as in Synthesis Example 1 for synthesizing Compound 1, except that, Intermediate I-7-1 was used instead of Intermediate I-1-1. The compound obtained therefrom was confirmed by LCMS.

LC-MS m/z=1119 (M+H)⁺

Synthesis Example 8: Synthesis of Compound 8

1) Synthesis of Intermediate I-8-2

Intermediate I-8-2 (yield: 85%) was synthesized in the same manner as in Synthesis Example 7 for synthesizing Intermediate I-7-2, except that 2-(3-bromo-5-(trifluoromethyl)phenyl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane was used instead of 2-(5-bromo-[1,1′-biphenyl]-3-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane. The compound obtained therefrom was confirmed by LCMS.

LC-MS m/z=474 (M+H)⁺

2) Synthesis of Intermediate I-8-1

Intermediate I-8-1 (yield: 50%) was synthesized in the same manner as in Synthesis Example 7 for synthesizing Intermediate I-7-1, except that Intermediate I-8-2 was used instead of Intermediate I-7-2. The compound obtained therefrom was confirmed by LCMS.

LC-MS m/z=910 (M+H)⁺

3) Synthesis of Compound 8

Compound 8 (yield: 20%) was synthesized in the same manner as in Synthesis Example 1 for synthesizing Compound 1, except that Intermediate I-8-1 was used instead of Intermediate I-1-1. The compound obtained therefrom was confirmed by LCMS.

LC-MS m/z=1103 (M+H)⁺

Synthesis Example 9: Synthesis of Compound 9

1) Synthesis of Intermediate I-9-2

Intermediate I-9-2 (yield: 80%) was synthesized in the same manner as in Synthesis Example 2 for synthesizing Intermediate I-2-2, except that 7-bromo-2-(2,6-dimethylphenyl)furo[2,3-c]pyridine and 2-(3-bromo-5-(trifluoromethyl)phenyl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane were used instead of 4-bromo-2-(2,6-dimethylphenyl)furo[3,2-c]pyridine and 2-(5-bromo-[1,1′-biphenyl]-3-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane, respectively. The compound obtained therefrom was confirmed by LCMS.

LC-MS m/z=446 (M+H)⁺

2) Synthesis of Intermediate I-9-1

Intermediate I-9-1 (yield: 60%) was synthesized in the same manner as in Synthesis Example 6 for synthesizing Intermediate I-6-1, except that Intermediate I-9-2 was used instead of Intermediate I-6-2. The compound obtained therefrom was confirmed by LCMS.

LC-MS m/z=853 (M+H)⁺

3) Synthesis of Compound 9

Compound 9 (yield: 35%) was synthesized in the same manner as in Synthesis Example 1 for synthesizing Compound 1, except that Intermediate I-9-1 was used instead of Intermediate I-1-1. The compound obtained therefrom was confirmed by LCMS.

LC-MS m/z=1046 (M+H)⁺

Synthesis Example 10: Synthesis of Compound 10

1) Synthesis of Intermediate I-10-1

Intermediate I-10-1 (yield: 55%) was synthesized in the same manner as in Synthesis Example 8 for synthesizing Intermediate I-8-1, except that 2,4-dimethylpyridin-3-amine was used instead of 4,6-dimethylpyrimidin-5-amine. The compound obtained therefrom was confirmed by LCMS.

LC-MS m/z=909 (M+H)⁺

2) Synthesis of Compound 10

Compound 10 (yield: 25%) was synthesized in the same manner as in Synthesis Example 1 for synthesizing Compound 1, except that Intermediate I-10-1 was used instead of Intermediate I-1-1. The compound obtained therefrom was confirmed by LCMS.

LC-MS m/z=1102 (M+H)⁺

Synthesis Example 11: Synthesis of Compound 11

1) Synthesis of Intermediate I-11-2

Intermediate I-11-2 (yield: 83%) was synthesized in the same manner as in Synthesis Example 7 for synthesizing Intermediate I-7-2, except that 7-bromo-2-(2,6-dimethylphenyl)furo[2,3-c]pyridine was used instead of 7-bromo-2-(4-(tert-butyl)phenyl)furo[2,3-c]pyridine. The compound obtained therefrom was confirmed by LCMS.

LC-MS m/z=454 (M+H)⁺

2) Synthesis of Intermediate I-11-1

Intermediate I-11-1 (yield: 65%) was synthesized in the same manner as in Synthesis Example 7 for synthesizing Intermediate I-7-1, except that Intermediate I-11-2 was used instead of Intermediate I-7-2. The compound obtained therefrom was confirmed by LCMS.

LC-MS m/z=870 (M+H)⁺

3) Synthesis of Compound 11

Compound 11 (yield: 40%) was synthesized in the same manner as in Synthesis Example 1 for synthesizing Compound 1, except that Intermediate I-11-1 was used instead of Intermediate I-1-1. The compound obtained therefrom was confirmed by LCMS.

LC-MS m/z=1063 (M+H)⁺

Synthesis Example 12: Synthesis of Compound 12

1) Synthesis of Intermediate I-12-6

9.6 g (31.0 mmol) of 3,5-dibromo-1,1′-biphenyl was dissolved in 250 ml of diethyl ether in a reactor, and then, 1.6 M n-BuLi in Hexane solution was slowly added dropwise thereto at a temperature of −78° C. The mixed solution was stirred at a temperature of −78° C. for 1 hour, and Iodine-solution in THF (9.5 g, 37 mmol) was slowly added dropwise thereto at a temperature of −78° C. for 30 minutes. After 30 minutes, the temperature of the reactor was raised to room temperature, and the reactor was stirred for 18 hours. When the reaction was completed, water and a saturated sodium thiosulfate-aqueous solution were added to the reactor, and an extraction process was performed thereon by using ethyl acetate. The organic layer obtained therefrom was dried by using magnesium sulfate to be distilled under reduced pressure, and purified by liquid chromatography to obtain 10.5 g (29.4 mmol, yield: 95%) of Intermediate I-12-6.

LC-MS m/z=360 (M+H)⁺

2) Synthesis of Intermediate I-12-5

10.5 g (29.4 mmol) of Intermediate I-12-6 and 100 ml of methanol were added to a Seal-tube, and then, 1.4 g (5.9 mmol) of 4,7-dimethoxyphenanthroline, 0.6 g (2.9 mmol) of CuI, and 19.1 g (58.8 mmol) of CsCO₃ were added thereto. The mixture was then heated and stirred under reflux at a temperature of 100° C. for 24 hours. When the reaction was completed, the resulting mixture was concentrated under reduced pressure, dissolved in dichloromethane, and filtered using diatomite. The organic layer obtained therefrom was dried by using magnesium sulfate to be distilled under reduced pressure, and purified by liquid chromatography to obtain 6.6 g (25.0 mmol, yield: 85%) of Intermediate I-12-5.

LC-MS m/z=264 (M+H)⁺

3) Synthesis of Intermediate I-12-4

6.6 g (25.0 mmol) of Intermediate I-12-5 was dissolved in 100 ml of dichloromethane in a reactor, and then, 1.0 M BBr₃ in dichloromethane solution was slowly added dropwise thereto at a temperature of 0° C. The mixed solution was stirred at a temperature of 0° C. for 1 hour, and stirred again at room temperature for 18 hours. When the reaction was completed, a small amount of methanol and a saturated sodium hydrogen carbonate-aqueous solution were added to the reactor at a temperature of 0° C., and an extraction process was performed thereon. The organic layer obtained therefrom was dried by using magnesium sulfate to be distilled under reduced pressure, and purified by liquid chromatography to obtain 5.9 g (23.7 mmol, yield: 95%) of Intermediate I-12-4.

4) Synthesis of Intermediate I-12-3

3.0 g (12.0 mmol) of Intermediate I-12-4 and 4.3 g (12.0 mmol) of Intermediate I-12-6 were dissolved in 60 ml of N,N-dimethylformamide in a reactor, and then, 0.2 g (1.2 mmol) of CuI, 0.3 g (2.4 mmol) of pyridine-2-carboxylic acid and 5.0 g (24.0 mmol) of K₃PO₄ were added thereto. The mixture was stirred at a temperature of 120° C. for 8 hours. When the reaction was completed, an extraction process was performed thereon by using water and ethyl acetate. The organic layer obtained therefrom was dried by using magnesium sulfate to be distilled under reduced pressure, and purified by liquid chromatography to obtain 3.1 g (6.6 mmol, yield: 55%) of Intermediate I-12-3.

5) Synthesis of Intermediate I-12-2

3.1 g (6.6 mmol) of Intermediate I-12-3, 5.0 g (19.8 mmol) of bis(pinacolato)diboron were dissolved in 60 ml of toluene, and then, 0.7 g (1.0 mmol) of PdCl₂(dppf)₂, 1.9 g of (19.8 mmol) of KOAc were added thereto. The mixture was stirred at a temperature of 125° C. for 18 hours. When the reaction was completed, the resulting mixture was filtered using diatomite, and an extraction process was performed thereby using water and ethyl acetate. The organic layer obtained therefrom was dried by using magnesium sulfate to be distilled under reduced pressure, and purified by liquid chromatography to obtain 4.1 g (7.2 mmol, yield: 60%) of Intermediate I-12-2.

6) Synthesis of Intermediate I-12-1

1.0 g (1.7 mmol) of Intermediate I-12-2 and 1.0 g (3.6 mmol) of 7-bromo-2-(2,6-dimethylphenyl)thieno[2,3-c]pyridine were dissolved in 50 ml of ethanol in a reactor, and then, 0.2 g (0.17 mmol) of Pd(PPh₃)₄ and 0.7 g (5.1 mmol) of K₂CO₃ were added thereto. The mixture was stirred at a temperature of 90° C. for 18 hours. When the reaction was completed, the resulting mixture was concentrated under reduced pressure, and an extraction process was performed thereby using water and dichloromethane. The organic layer obtained therefrom was dried by using magnesium sulfate to be distilled under reduced pressure, and purified by liquid chromatography to obtain 0.6 g (0.82 mmol, yield: 48%) of Intermediate I-12-1.

LC-MS m/z=797 (M+H)⁺

7) Synthesis of Compound 12

Compound 12 (yield: 60%) was synthesized in the same manner as in Synthesis Example 1 for synthesizing Compound 1, except that Intermediate I-12-1 was used instead of Intermediate I-1-1. The compound obtained therefrom was confirmed by LCMS.

LC-MS m/z=990 (M+H)⁺

Synthesis Example 13: Synthesis of Compound 13

1) Synthesis of Intermediate I-13-1

Intermediate I-13-1 (yield: 45%) was synthesized in the same manner as in Synthesis Example 12 for synthesizing Intermediate I-12-1, except that 7-bromo-2-phenylthieno[2,3-c]pyridine was used instead of 7-bromo-2-(2,6-dimethylphenyl)thieno[2,3-c]pyridine. The compound obtained therefrom was confirmed by LCMS.

LC-MS m/z=741 (M+H)⁺

2) Synthesis of Compound 13

Compound 13 (yield: 20%) was synthesized in the same manner as in Synthesis Example 1 for synthesizing Compound 1, except that Intermediate I-13-1 was used instead of Intermediate I-1-1. The compound obtained therefrom was confirmed by LCMS.

LC-MS m/z=934 (M+H)⁺

Synthesis Example 14: Synthesis of Compound 14

1) Synthesis of Intermediate I-14-1

Intermediate I-14-1 (yield: 55%) was synthesized in the same manner as in Synthesis Example 12 for synthesizing Intermediate I-12-1, except that 7-bromo-2-(4-(tert-butyl)phenyl)furo[2,3-c]pyridine was used instead of 7-bromo-2-(2,6-dimethylphenyl)thieno[2,3-c]pyridine. The compound obtained therefrom was confirmed by LCMS.

LC-MS m/z=821 (M+H)⁺

2) Synthesis of Compound 14

Compound 14 (yield: 25%) was synthesized in the same manner as in Synthesis Example 1 for synthesizing Compound 1, except that Intermediate I-14-1 was used instead of Intermediate I-1-1. The compound obtained therefrom was confirmed by LCMS.

LC-MS m/z=1014 (M+H)⁺

Synthesis Example 15: Synthesis of Compound 15

1) Synthesis of Intermediate I-15-7

17.3 g (47.9 mmol) of 1,3-dibromo-5-iodobenzene and 7.2 g (50.3 mmol) of (5-methylthiophen-2-yl)boronic acid were dissolved in 300 ml of THF and 75 ml of water in a reactor, and then, 3.8 g (3.3 mmol) of Pd(PPh₃)₄ and 16.6 g (119.7 mmol) of K₂CO₃ were added thereto. The mixture was stirred for 18 hours. When the reaction was completed, the resulting mixture was extracted using water and ethyl acetate to collect the organic layer, and that the organic layer obtained therefrom was dried by using magnesium sulfate to be distilled under reduced pressure, and purified by liquid chromatography to obtain 11.0 g (33.1 mmol, yield: 70%) of Intermediate I-15-7.

LC-MS m/z=330 (M+H)⁺

2) Synthesis of Intermediate I-15-6

Intermediate I-15-6 (yield: 95%) was synthesized in the same manner as in Synthesis Example 12 for synthesizing Intermediate I-12-6, except that Intermediate I-15-7 was used instead of 3,5-dibromo-1,1′-biphenyl. The compound obtained therefrom was confirmed by LCMS.

LC-MS m/z=339 (M+H)⁺

3) Synthesis of Intermediate I-15-5

Intermediate I-15-6 (yield: 80%) was synthesized in the same manner as in Synthesis Example 12 for synthesizing Intermediate I-12-5, except that Intermediate I-15-6 was used instead of Intermediate I-12-6. The compound obtained therefrom was confirmed by LCMS.

LC-MS m/z=283 (M+H)⁺

4) Synthesis of Intermediate I-15-4

Intermediate I-15-4 (yield: 90%) was synthesized in the same manner as in Synthesis Example 12 for synthesizing Intermediate I-12-4, except that Intermediate I-15-5 was used instead of Intermediate I-12-5. The compound obtained therefrom was confirmed by LCMS.

LC-MS m/z=269 (M+H)⁺

5) Synthesis of Intermediate I-15-3

Intermediate I-15-3 (yield: 45%) was synthesized in the same manner as in Synthesis Example 12 for synthesizing Intermediate I-12-3, except that Intermediate I-15-4 was used instead of Intermediate I-12-4. The compound obtained therefrom was confirmed by LCMS.

LC-MS m/z=519 (M+H)⁺

6) Synthesis of Intermediate I-15-2

Intermediate I-15-2 (yield: 70%) was synthesized in the same manner as in Synthesis Example 12 for synthesizing Intermediate I-12-2, except that Intermediate I-15-3 was used instead of Intermediate I-12-3. The compound obtained therefrom was confirmed by LCMS.

LC-MS m/z=615 (M+H)⁺

7) Synthesis of Intermediate I-15-1

Intermediate I-15-1 (yield: 70%) was synthesized in the same manner as in Synthesis Example 12 for synthesizing Intermediate I-12-1, except that Intermediate I-15-2 and 7-bromo-2-(4-(tert-butyl)phenyl)thieno[2,3-c]pyridine were used instead of Intermediate I-12-2 and 7-bromo-2-phenylthieno[2,3-c]pyridine, respectively. The compound obtained therefrom was confirmed by LCMS.

LC-MS m/z=893 (M+H)⁺

7) Synthesis of Compound 15

Compound 15 (yield: 30%) was synthesized in the same manner as in Synthesis Example 1 for synthesizing Compound 1, except that Intermediate I-15-1 was used instead of Intermediate I-1-1. The compound obtained therefrom was confirmed by LCMS.

LC-MS m/z=1086 (M+H)⁺

Example 1

As an anode, a glass substrate on which ITO/Ag/ITO was deposited to a thickness of 70 Å/1,000 Å/70 Å was cut into a size of 50 mm×50 mm×0.5 mm (mm=millimeters), sonicated with iso-propyl alcohol and pure water each for 5 minutes, and then, cleaned by exposure to ultraviolet rays and ozone for 30 minutes. Then, the glass substrate was provided to a vacuum deposition apparatus.

2-TNATA was deposited on the anode formed on the glass substrate to form a hole injection layer having a thickness of 600 Å, and 4,4′-bis[N-(1-naphthyl)-N-phenylamino]biphenyl (hereinafter, referred to as NPB) was deposited on the hole injection layer to form a hole transport layer having a thickness of 1,350 Å.

CBP (host) and Compound 1 (dopant) were co-deposited on the hole transport layer at a host-to-dopant weight ratio of 98:2 to form an emission layer having a thickness of 400 Å. Then, BCP was deposited on the emission layer to form a hole blocking layer having a thickness of 50 Å. Next, Alq₃ was deposited on the hole blocking layer to form an electron transport layer having a thickness of 350 Å, LiF was formed on the electron transport layer to form an electron injection layer having a thickness of 10 Å, and Mg and Ag were deposited on the electron injection layer at a Mg-to-Al weight ratio of 90:10 to form a cathode having a thickness of 120 Å, thereby completing the manufacture of an organic light-emitting device (i.e., a bottom emission type light-emitting device emitting red light) having a structure of ITO/Ag/ITO/2-TNATA (600 Å)/NPB (1,350 Å)/CBP+Compound 1 (2 weight %) (400 Å)/BCP (50 Å)/Alq₃ (350 Å)/LiF (10 Å)/MgAg (120 Å):

Examples 2 to 15 and Comparative Examples a to C

Organic light-emitting devices were manufactured in the same manner as in Example 1, except that Compounds shown in Table 2 were each used as a dopant for forming the emission layer instead of Compound 1.

Evaluation Example 1: Evaluation of Electroluminescence (EL) Spectrum

Regarding the organic light-emitting devices prepared according to Examples 1 to 15 and Comparative Examples A to C, an ISC PC1 spectrofluorometer equipped with a Xenon lamp was used to measure an EL spectrum thereof at room temperature. Then, the emission intensity of a short-wavelength tail at a distance of about −50 nanometers (nm) from the maximum emission wavelength (λ_(max)) in the EL spectrum (at λ_(max)-50 nm) (arbitrary units, a.u.) was measured, and results thereof are summarized in Table 2. FIG. 2 shows EL spectrum of each of the organic light-emitting devices prepared according to Examples 1, 3, and 6 and Comparative Examples A to C.

TABLE 2 Dopant Emission intensity Compound (at λ_(max)-50 nm) OLED No. (a.u.) Example 1  1 0.0365 Example 2  2 0.0372 Example 3  3 0.0377 Example 4  4 0.0559 Example 5  5 0.0430 Example 6  6 0.0290 Example 7  7 0.0497 Example 8  8 0.0245 Example 9  9 0.0550 Example 10 10 0.0326 Example 11 11 0.0555 Example 12 12 0.0270 Example 13 13 0.0270 Example 14 14 0.0273 Example 15 15 0.0405 Comparative Example Ref 1 0.1159 A Comparative Example Ref 2 0.1868 B Comparative Example Ref 3 0.2105 C

Referring to Table 2, it was confirmed that the organic light-emitting devices prepared according to Examples 1 to 15, and respectively including Compounds 1 to 15 as a dopant, had an EL spectrum of a wave pattern with a remarkable reduced emission intensity of the tail at a distance of about −0.5 nm from the maximum emission wavelength (at λ_(max)-50 nm), as compared with the organic light-emitting devices prepared according to Comparative Examples A to C and respectively including Compounds Ref 1 to Ref 3 as a dopant.

Evaluation Example 2: Evaluation of Characteristics of Organic Light-Emitting Device (Bottom Emission Type)

The driving voltage, maximum quantum emission efficiency, full width/half maximum (FWHM) of an EL spectrum, emission intensity (at λ_(max)-50 nm) (a.u.) (same as data as in Table 2) of a short-wavelength tail at a distance of −50 nm from the maximum emission wavelength in an EL spectrum, the maximum emission wavelength in an EL spectrum, and lifespan (LT₉₅) of the organic light-emitting devices manufactured according to Examples 1, 3, 6, 13, 14, and 15 and Comparative Examples A and C are measured, and results thereof are shown in Table 3. This evaluation was performed using a current-voltage meter (Keithley 2400) and luminance meter (Minolta Cs-1,000A). Lifespan (LT₉₅) refers to the time taken until luminance is decreased to 95% of initial luminance 100%.

TABLE 3 Maximum Emission quantum intensity Maximum Dopant Driving emission (at λ_(max)- emission Compound voltage efficiency Emission FWHM 50 nm) wavelength LT₉₅ No. (V) (%) color (nm) (a.u.) (nm) (hr) Example 1 1 4.8 22.1 Red 64.5 0.0365 629 ~1000 Example 3 3 4.7 21.5 Red 45.0 0.0377 624 ~1000 Example 6 6 4.7 23.8 Red 44.6 0.0290 628 ~1500 Example 13 13 4.2 20.4 Red 49.9 0.0270 610 ~1500 Example 14 14 4.0 23.8 Red 42.0 0.0273 590 ~1500 Example 15 15 4.7 23.3 Red 50.0 0.0405 620 ~1000 Comparative Ref 1 5.2 19.1 Red 70.9 0.1159 627 ~1000 Example A Comparative Ref 3 4.5 19.8 Red 96.8 0.2105 582 ~1000 Example C

Referring to Table 3, it was confirmed that, as compared with the organic light-emitting devices of Comparative Examples A and C, the organic light-emitting devices of Examples 1, 3, 5, 13, 14, and 15 exhibited more excellent or equal driving voltage, maximum quantum emission efficiency, and lifespan, but had simultaneously relatively small FWHM, and emitted red light having a relatively small emission intensity (at λ_(max)-50 nm).

Example 16

As an anode, a glass substrate on which ITO/A1 was deposited to a thickness of 70 Å/1,000 Å was cut into a size of 50 mm×50 mm×0.5 mm, sonicated with iso-propyl alcohol and pure water each for 5 minutes, and then, cleaned by exposure to ultraviolet rays and ozone for 30 minutes. Then, the glass substrate was provided to a vacuum deposition apparatus.

2-TNATA was deposited on the anode formed on the glass substrate to a form a hole injection layer having a thickness of 600 Å, and NPB was deposited on the hole injection layer to form a hole transport layer having a thickness of 900 Å.

CBP (host) and Compound 1 (dopant) were co-deposited on the hole transport layer at a host-to-dopant weight ratio of 98:2 to form an emission layer having a thickness of 400 Å. Then, BCP was deposited on the emission layer to form a hole blocking layer having a thickness of 50 Å. Next, Alq₃ was deposited on the hole blocking layer to form an electron transport layer having a thickness of 350 Å, LiF was formed on the electron transport layer to form an electron injection layer having a thickness of 10 Å, and Mg and Ag were deposited on the electron injection layer at a Mg-to-Al weight ratio of 90:10 to form a cathode having a thickness of 120 Å, thereby completing the manufacture of an organic light-emitting device (i.e., a top emission type light-emitting device emitting red light) having a structure of ITO/A1/2-TNATA (600 Å)/NPB (900 Å)/CBP+Compound 1 (2 weight %) (400 Å)/BCP (50 Å)/Alq₃ (35 0 Å)/LiF (10 Å)/MgAg (120 Å). NPB was additionally deposited on the cathode to form a capping layer having a thickness of 800 Å.

Examples 17 and 18 and Comparative Examples D to F

Organic light-emitting devices were manufactured in the same manner as in Example 16, except that Compounds shown in Table 4 were each used instead of Compound 1 as a dopant in forming an emission layer.

Evaluation Example 3: Evaluation of Characteristics of Organic Light-Emitting Device (Top Emission Type)

Regarding the organic light-emitting devices prepared according to Examples 16 to 18 and Comparative Examples D to F, the emission intensity of a short-wavelength tail at a distance of about −50 nm from the maximum wavelength (λ_(max)) in the EL spectrum (at λ_(max)-50 nm)(a.u.) was measured according to the same method described in Evaluation Example 1, and the emission efficiency (at CIE_(x)=0.685) of the organic light-emitting devices were evaluated. Results thereof are summarized in Table 4. Here, as a device used for evaluating the emission efficiency, a current-voltage meter (Keithley 2400) and a luminance meter (Minolta Cs-1000A) were used.

TABLE 4 Emission Emission Dopant intensity efficiency (at compound (at λ_(max)-50 nm) CIE_(x) = 0.685) No. (a.u.) (cd/A) Example 16 1 0.035 34.6 Example 17 3 0.026 34.3 Example 18 6 0.030 34.5 Comparative Ref 1 0.117 30.7 Example D Comparative Ref 2 0.203 18.1 Example E Comparative Ref 3 0.226 12.6 Example F

Referring to Table 4, it was confirmed that, as compared with the organic light-emitting devices of Comparative Examples D to F, the organic light-emitting devices of Examples 16 to 18 each had more excellent emission efficiency and the EL spectrum with a wave pattern in which the emission intensity of a tail at a distance of about −50 nm from the maximum emission wavelength in the EL spectrum (emission intensity at λ_(max)-50 nm) was significantly reduced.

According to the one or more embodiments of the present disclosure, an organometallic compound has excellent electric characteristics and thermal stability. Accordingly, an organic light-emitting device including the organometallic compound may have excellent driving voltage, maximum quantum emission efficiency, full width/half maximum (FWHM) of an EL spectrum, emission intensity (at λ_(max)-50 nm) (a.u.) of a short-wavelength tail at a distance of −50 nm from the maximum emission wavelength in an EL spectrum, and lifespan (LT₉₅), due to excellent phosphorescent emission characteristics of the organometallic compound, a diagnostic composition using the organometallic compound may accordingly have high diagnostic efficiency.

It should be understood that embodiments described herein should be considered in a descriptive sense only and not for purposes of limitation. Descriptions of features or aspects within each embodiment should typically be considered as available for other similar features or aspects in other embodiments.

While one or more embodiments have been described with reference to the figures, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present description as defined by the following claims. 

What is claimed is:
 1. An organometallic compound represented by Formula 1:

wherein, M in Formula 1 is a transition metal, X₁ in Formula 1 is nitrogen (N), X₂ to X₄ in Formula 1 are each independently carbon (C) or N, in Formula 1, a bond between X₁ and M is a coordinate bond, and one bond selected from a bond between X₂ and M, a bond between X₃ and M, and a bond between X₄ and M is a coordinate bond while the remaining two bonds are each independently be a covalent bond, n in Formula 1 is 0 or 1, wherein, when n is 0, CY₁ and CY₄ are not linked each other, in Formula 1, i) when n is 0, CY₁ is a group represented by one selected from Formulae A1-1 to A1-6; and ii) when n is 1, CY₁ is a group represented by one selected from Formulae A11-1 to A11-4, in Formulae A1-1 to A1-6 and A11-1 to A11-4, i) X₁₁ is *—N[(L₁₁)_(c11)-(R₁₁)]—*′, *—B(R₁₁)—*′, *—P(R₁₁)—*′, *—C(R_(11a))(R_(11b))—*′, *—Si(R_(11a))(R_(11b))—*′, *—Ge(R_(11a))(R_(11b))—*′, *—S—*′, *—Se—*′, *—O—*′, *—C(═O)—*′, *—S(═O)—*′, *—S(═O)₂—*′, or *—C(═S)—*′, X₁₂ is C(R₁₂) or N, X₁₃ is C(R₁₃) or N, X₁₄ is C(R₁₄) or N, and X₁₅ s is C(R₁₅) or N; ii) when X₁₄ is C(R₁₄) and X₁₅ is C(R₁₅), R₁₄ and R₁₅ are not linked each other; and iii) R_(11a) and R_(11b) are optionally linked each other via a second linking group to form a substituted or unsubstituted C₅-C₃₀ carbocyclic group or a substituted or unsubstituted C₁-C₃₀ heterocyclic group, in Formulae A1-1 to A1-6 and A11-1 to A11-4, * may indicate a binding site to M in Formula 1, *′ may indicate a binding site to T₁ in Formula 1, and *″ may indicate a binding site to T₄ in Formula 1, in Formula 1, CY₂ to CY₄ are each independently selected from a C₅-C₃₀ carbocyclic group and a C₁-C₃₀ heterocyclic group, in Formula 1, T₁ to T₄ are each independently selected from a single bond, a double bond, *—N[(L₅)_(c5)-(R₅)]—*′, *—B(R₅)—*′, *—P(R₅)—*′, *—C(R₅)(R₆)—*′, *—Si(R₅)(R₆)—*′, *—Ge(R₅)(R₆)—*′, *—S—*′, *—Se—*′, *—O—*′, *—C(═O)—*′, *—S(═O)—*′, *—S(═O)₂—*′, *—C(R₅)═*′, *═C(R₅)—*′, *—C(R₅)═C(R₆)—*′, *—C(═S)—*′, and *—C≡C—*′, wherein R₅ and R₆ are optionally linked each other via a first linking group to form a substituted or unsubstituted C₅-C₃₀ carbocyclic group or a substituted or unsubstituted C₁-C₃₀ heterocyclic group, L₅ and L₁₁ are each independently selected from a single bond, a substituted or unsubstituted C₅-C₃₀ carbocyclic group, and a substituted or unsubstituted C₁-C₃₀ heterocyclic group, c5 and c11 are each independently an integer from 1 to 3, wherein, when c5 is two or more, two or more of groups L₅ are identical to or different from each other, and when c11 is two or more, two or more of groups L₁₁ are identical to or different from each other, R₂ to R₆, R₁₁ to R₁₅, R_(11a), and R_(11b) are each independently selected from hydrogen, deuterium, —F, —Cl, —Br, —I, —SF₅, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a substituted or unsubstituted C₁-C₆₀ alkyl group, a substituted or unsubstituted C₂-C₆₀ alkenyl group, a substituted or unsubstituted C₂-C₆₀ alkynyl group, a substituted or unsubstituted C₁-C₆₀ alkoxy group, a substituted or unsubstituted C₃-C₁₀ cycloalkyl group, a substituted or unsubstituted C₁-C₁₀ heterocycloalkyl group, a substituted or unsubstituted C₃-C₁₀ cycloalkenyl group, a substituted or unsubstituted C₁-C₁₀ heterocycloalkenyl group, a substituted or unsubstituted C₆-C₆₀ aryl group, a substituted or unsubstituted C₇-C₆₀ alkyl aryl group, a substituted or unsubstituted C₆-C₆₀ aryloxy group, a substituted or unsubstituted C₆-C₆₀ arylthio group, a substituted or unsubstituted C₇-C₆₀ arylalkyl group, a substituted or unsubstituted C₁-C₆₀ heteroaryl group, a substituted or unsubstituted C₂-C₆₀ alkyl heteroaryl group, a substituted or unsubstituted C₁-C₆₀ heteroaryloxy group, a substituted or unsubstituted C₁-C₆₀ heteroarylthio group, a substituted or unsubstituted C₂-C₆₀ heteroaryl alkyl group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group, —N(Q₁)(Q₂), —Si(Q₃)(Q₄)(Q₅), —B(Q₆)(Q₇), and —P(═O)(Q₅)(Q₉), in Formula 1, a2 to a4 are each independently an integer from 0 to 20, in Formula 1, two or more selected from groups R₂ in the number of a2 are optionally linked each other to forma substituted or unsubstituted C₅-C₃₀ carbocyclic group or a substituted or unsubstituted C₁-C₃₀ heterocyclic group, in Formula 1, two or more selected from groups R₃ in the number of a3 are optionally linked each other to form a substituted or unsubstituted C₅-C₃₀ carbocyclic group or a substituted or unsubstituted C₁-C₃₀ heterocyclic group, in Formula 1, two or more selected from groups R₄ in the number of a4 are optionally linked each other to form a substituted or unsubstituted C₅-C₃₀ carbocyclic group or a substituted or unsubstituted C₁-C₃₀ heterocyclic group, in Formula 1, two or more of R₂ to R₄ are optionally linked each other to form a substituted or unsubstituted C₅-C₃₀ carbocyclic group or a substituted or unsubstituted C₁-C₃₀ heterocyclic group, in Formula 1, one of R₅ and R₆ and one of R₂ to R₄ are optionally linked each other to form a substituted or unsubstituted C₅-C₃₀ carbocyclic group or a substituted or unsubstituted C₁-C₃₀ heterocyclic group, at least one substituent of the substituted C₅-C₃₀ carbocyclic group, the substituted C₁-C₃₀ heterocyclic group, the substituted C₁-C₆₀ alkyl group, the substituted C₂-C₆₀ alkenyl group, the substituted C₂-C₆₀ alkynyl group, the substituted C₁-C₆₀ alkoxy group, the substituted C₃-C₁₀ cycloalkyl group, the substituted C₁-C₁₀ heterocycloalkyl group, the substituted C₃-C₁₀ cycloalkenyl group, the substituted C₁-C₁₀ heterocycloalkenyl group, the substituted C₆-C₆₀ aryl group, the substituted C₇-C₆₀ alkyl aryl group, the substituted C₆-C₆₀ aryloxy group, the substituted C₆-C₆₀ arylthio group, the substituted C₇-C₆₀ aryl alkyl group, the substituted C₁-C₆₀ heteroaryl group, the substituted C₂-C₆₀ alkyl heteroaryl group, the substituted C₁-C₆₀ heteroaryloxy group, the substituted C₁-C₆₀ heteroarylthio group, the C₂-C₆₀ heteroaryl alkyl group, the substituted monovalent non-aromatic condensed polycyclic group, and the substituted monovalent non-aromatic condensed heteropolycyclic group is selected from: deuterium, —F, —Cl, —Br, —I, —CD₃, —CD₂H, —CDH₂, —CF₃, —CF₂H, —CFH₂, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, and a C₁-C₆₀ alkoxy group; a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, and a C₁-C₆₀ alkoxy group, each substituted with at least one selected from deuterium, —F, —Cl, —Br, —I, —CD₃, —CD₂H, —CDH₂, —CF₃, —CF₂H, —CFH₂, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₇-C₆₀ alkyl aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₇-C₆₀ aryl alkyl group, a C₁-C₆₀ heteroaryl group, a C₂-C₆₀ alkyl heteroaryl group, a C₁-C₆₀ heteroaryloxy group, a C₁-C₆₀ heteroarylthio group, a C₂-C₆₀ heteroaryl alkyl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, —N(Q₁₁)(Q₁₂), —Si(Q₁₃)(Q₁₄)(Q₁₅), —B(Q₁₆)(Q₁₇), and —P(═O)(Q₁₈)(Q₁₉); a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₇-C₆₀ alkyl aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₇-C₆₀ aryl alkyl group, a C₁-C₆₀ heteroaryl group, a C₁-C₆₀ heteroaryloxy group, a C₁-C₆₀ heteroarylthio group, a C₂-C₆₀ heteroaryl alkyl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group; a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₇-C₆₀ alkyl aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₇-C₆₀ aryl alkyl group, a C₁-C₆₀ heteroaryl group, a C₂-C₆₀ alkyl heteroaryl group, a C₁-C₆₀ heteroaryloxy group, a C₁-C₆₀ heteroarylthio group, a C₂-C₆₀ heteroaryl alkyl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group, each substituted with at least one selected from deuterium, —F, —Cl, —Br, —I, —CD₃, —CD₂H, —CDH₂, —CF₃, —CF₂H, —CFH₂, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₇-C₆₀ alkyl aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₇-C₆₀ aryl alkyl group, a C₁-C₆₀ heteroaryl group, a C₂-C₆₀ alkyl heteroaryl group, a C₁-C₆₀ heteroaryloxy group, a C₁-C₆₀ heteroarylthio group, a C₂-C₆₀ heteroaryl alkyl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, —N(Q₂₁)(Q₂₂), —Si(Q₂₃)(Q₂₄)(Q₂₅), —B(Q₂₆)(Q₂₇), and —P(═O)(Q₂₈)(Q₂₉); and —N(Q₃₁)(Q₃₂), —Si(Q₃₃)(Q₃₄)(Q₃₅), —B(Q₃₆)(Q₃₇), and —P(═O)(Q₃₈)(Q₃₉), and Q₁ to Q₉, Q₁₁ to Q₁₉, Q₂₁ to Q₂₉, and Q₃₁ to Q₃₉ are each independently selected from hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryl group substituted with at least one selected from a C₁-C₆₀ alkyl group, and a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₇-C₆₀ aryl alkyl group, a C₁-C₆₀ heteroaryl group, a C₂-C₆₀ alkyl heteroaryl group, a C₁-C₆₀ heteroaryloxy group, a C₁-C₆₀ heteroarylthio group, a C₂-C₆₀ heteroaryl alkyl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group.
 2. The organometallic compound of claim 1, wherein M is Pt, Pd, or Au, X₄ is N, and a bond between X₄ and M is a coordinate bond.
 3. The organometallic compound of claim 1, wherein CY₂ to CY₄ are each independently selected from a benzene group, a naphthalene group, an anthracene group, a phenanthrene group, a triphenylene group, a pyrene group, a chrysene group, a cyclopentadiene group, a 1,2,3,4-tetrahydronaphthalene group, a thiophene group, a furan group, an indole group, a benzoborole group, a benzophosphole group, an indene group, a benzosilole group, a benzogermole group, a benzothiophene group, a benzoselenophene group, a benzofuran group, a carbazole group, a dibenzoborole group, a dibenzophosphole group, a fluorene group, a dibenzosilole group, a dibenzogermole group, a dibenzothiophene group, a dibenzoselenophene group, a dibenzofuran group, a dibenzothiophene 5-oxide group, a 9H-fluorene-9-one group, a dibenzothiophene 5,5-dioxide group, an azaindole group, an azabenzoborole group, an azabenzophosphole group, an azaindene group, an azabenzosilole group, an azabenzogermole group, an azabenzothiophene group, an azabenzoselenophene group, an azabenzofuran group, an azacarbazole group, an azadibenzoborole group, an azadibenzophosphole group, an azafluorene group, an azadibenzosilole group, an azadibenzogermole group, an azadibenzothiophene group, an azadibenzoselenophene group, an azadibenzofuran group, an azadibenzothiophene 5-oxide group, an aza-9H-fluorene-9-one group, an azadibenzothiophene 5,5-dioxide group, a pyridine group, a pyrimidine group, a pyrazine group, a pyridazine group, a triazine group, a quinoline group, an isoquinoline group, a quinoxaline group, a quinazoline group, a phenanthroline group, a pyrrole group, a pyrazole group, an imidazole group, a triazole group, an oxazole group, an isooxazole group, a thiazole group, an isothiazole group, an oxadiazole group, a thiadiazole group, a benzopyrazole group, a benzimidazole group, a benzoxazole group, a benzothiazole group, a benzooxadiazole group, a benzothiadiazole group, a 5,6,7,8-tetrahydroisoquinoline group, and a 5,6,7,8-tetrahydroquinoline group.
 4. The organometallic compound of claim 1, wherein X₂ and X₃ are C, CY₂ and CY₃ are each independently selected from a benzene group, a naphthalene group, an anthracene group, a phenanthrene group, a triphenylene group, a pyrene group, a chrysene group, a cyclopentadiene group, a 1,2,3,4-tetrahydronaphthalene group, a thiophene group, a furan group, an indole group, a benzoborole group, a benzophosphole group, an indene group, a benzosilole group, a benzogermole group, a benzothiophene group, a benzoselenophene group, a benzofuran group, a carbazole group, a dibenzoborole group, a dibenzophosphole group, a fluorene group, a dibenzosilole group, a dibenzogermole group, a dibenzothiophene group, a dibenzoselenophene group, a dibenzofuran group, a dibenzothiophene 5-oxide group, a 9H-fluorene-9-one group, and a dibenzothiophene 5,5-dioxide group.
 5. The organometallic compound of claim 1, wherein CY₁ and CY₄ are identical to each other.
 6. The organometallic compound of claim 1, wherein T₁ is a single bond, T₂ is not a single bond, and n is
 0. 7. The organometallic compound of claim 1, wherein R₂ to R₆, R₁₁ to R₁₅, R_(11a), and R_(11b) are each independently selected from: hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, —SF₅, C₁-C₂₀ alkyl group, and a C₁-C₂₀ alkoxy group; a C₁-C₂₀ alkyl group and a C₁-C₂₀ alkoxy group, each substituted with at least one selected from deuterium, —F, —Cl, —Br, —I, —CD₃, —CD₂H, —CDH₂, —CF₃, —CF₂H, —CFH₂, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₁₀ alkyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group, a phenyl group, a biphenyl group, a naphthyl group, a pyridinyl group, and a pyrimidinyl group; a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group, a phenyl group, a biphenyl group, a C₁-C₂₀ alkylphenyl group, a naphthyl group, a fluorenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an isoindolyl group, an indolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, a carbazolyl group, a phenanthrolinyl group, a benzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, an imidazopyridinyl group, and an imidazopyrimidinyl group; a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group, a phenyl group, a biphenyl group, a C₁-C₂₀ alkylphenyl group, a naphthyl group, a fluorenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an isoindolyl group, an indolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, a carbazolyl group, a phenanthrolinyl group, a benzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, an imidazopyridinyl group, and an imidazopyrimidinyl group, each substituted with at least one selected from deuterium, —F, —Cl, —Br, —I, —CD₃, —CD₂H, —CDH₂, —CF₃, —CF₂H, —CFH₂, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, an adamantanyl group, a norbornanyl group, a norbornenyl group, a cyclopentenyl group, a cyclohexenyl group, a cycloheptenyl group, a phenyl group, a biphenyl group, a C₁-C₂₀ alkylphenyl group, a naphthyl group, a fluorenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an isoindolyl group, an indolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, a carbazolyl group, a phenanthrolinyl group, a benzimidazolyl group, a benzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, an imidazopyridinyl group, and an imidazopyrimidinyl group; and —N(Q₁)(Q₂), —Si(Q₃)(Q₄)(Q₅), —B(Q₆)(Q₇), and —P(═O)(Q₈)(Q₉), and Q₁ to Q₉ are each independently selected from: —CH₃, —CD₃, —CD₂H, —CDH₂, —CH₂CH₃, —CH₂CD₃, —CH₂CD₂H, —CH₂CDH₂, —CHDCH₃, —CD₂CH₃, —CHDCD₂H, —CHDCDH₂, —CHDCD₃, —CD₂CD₃, —CD₂CD₂H, and —CD₂CDH₂; an n-propyl group, an iso-propyl group, an n-butyl group, an iso-butyl group, a sec-butyl group, a tert-butyl group, an n-pentyl group, an iso-pentyl group, a sec-pentyl group, a tert-pentyl group, a phenyl group, and a naphthyl group; and an n-propyl group, an iso-propyl group, an n-butyl group, an iso-butyl group, a sec-butyl group, a tert-butyl group, an n-pentyl group, an iso-pentyl group, a sec-pentyl group, a tert-pentyl group, a phenyl group, and a naphthyl group, each substituted with at least one selected from deuterium, a C₁-C₁₀ alkyl group, and a phenyl group.
 8. The organometallic compound of claim 1, wherein R₂ to R₆, R₁₁ to R₁₅, R_(11a) and R_(11b) are each independently selected from hydrogen, deuterium, —F, a cyano group, a nitro group, —SF₅, —CH₃, —CD₃, —CD₂H, —CDH₂, —CF₃, —CF₂H, —CFH₂, a group represented by one selected from Formulae 9-1 to 9-19 and 10-1 to 10-186, and —Si(Q₃)(Q₄)(Q₅):

wherein, in Formulae 9-1 to 9-19 and 10-1 to 10-186, * indicates a binding site to a neighboring atom, Ph indicates a phenyl group, and TMS indicates a trimethylsilyl group, and wherein Q₃ to Q₅ are the same as defined in claim
 1. 9. The organometallic compound of claim 1, wherein a moiety represented by

in Formula 1 is represented by one selected from Formulae A2-1(1) to A2-1(21):

wherein, in Formulae A2-1 (1) to A2-1(21), X₂ and R₂ are respectively the same as described in claim 1, X₂₁ is O, S, N(R₂₁), C(R₂₁)(R₂₂), or Si(R₂₁)(R₂₂), R₂₁ to R₂₈ are respectively the same as described in connection with R₂ in claim 1, a25 is an integer from 0 to 5, a24 is an integer from 0 to 4, a23 is an integer from 0 to 3, a22 is an integer from 0 to 2, *indicates a binding site to M in Formula 1, *′ indicates a binding site to T₁ in Formula 1, and *″ indicates a binding site to T₂ in Formula
 1. 10. The organometallic compound of claim 1, wherein a moiety represented by

in Formula 1 is represented by one selected from Formulae A3-1(1) to A3-1(21):

wherein, in Formulae A3-1(1) to A3-1(21), X₃ and R₃ are respectively the same as described in claim 1, X₃₁ is O, S, N(R₃₁), C(R₃₁)(R₃₂), or Si(R₃₁)(R₃₂), R₃₁ to R₃₈ are respectively the same as described in connection with R₃ in claim 1, a35 is an integer from 0 to 5, a34 is an integer from 0 to 4, a33 is an integer from 0 to 3, a32 is an integer from 0 to 2, * indicates a binding site to M in Formula 1, *′ indicates a binding site to T₃ in Formula 1, and *″ indicates a binding site to T₂ in Formula
 1. 11. The organometallic compound of claim 1, wherein, in Formula 1, n is 0, and a moiety represented by

is represented by one selected from Formulae A4-1 to A4-6, A4-1 (1) to A4-1(44), and A4-2(1) to A4-2(71); or n is 1, and a moiety represented by

is represented by one selected from Formulae A14-1 to A14-4 and A14-1(1) to A14-1(17):

wherein, in Formulae A4-1 to A4-6, A4-1 (1) to A4-1(44), A4-2(1) to A4-2(71), A14-1 to A14-4, and A14-1(1) to A14-1(17), X₄ and R₄ are respectively the same as described in claim 1, X₄₁ is O, S, N(R₄₁), C(R₄₁)(R₄₂), Or Si(R₄₁)(R₄₂), X₄₂ is N or C(R₄₂), X₄₃ is N or C(R₄₃), X₄₄ is N or C(R₄₄), X₄₅ is N or C(R₄₅), R₄₁ to R₄₈ are respectively the same as described in connection with R₄, a47 is an integer from 0 to 7, a46 is an integer from 0 to 6, a45 is an integer from 0 to 5, a44 is an integer from 0 to 4, a43 is an integer from 0 to 3, a42 is an integer from 0 to 2, * indicates a binding site to M in Formula 1, *′ indicates a binding site to T₃ in Formula 1, and *″ indicates a binding site to T₄ in Formula
 1. 12. The organometallic compound of claim 11, wherein T₃ is a single bond, n is 0, and a moiety represented by

is represented by one selected from Formulae A4-1 to A4-6, A4-1(1) to A4-1(44), and A4-2(1) to A4-2(71); or T₃ is not a single bond, n is 1, and a moiety represented by

is by one selected from Formulae A14-1 to A14-4 and A14-1 (1) to A14-1(17).
 13. The organometallic compound of claim 1, wherein, in Formula 1, n is 0, a moiety represented by

is selected from groups represented by Formulae CY1-1 to CY1-8, a moiety represented by

is selected from groups represented by Formulae CY2-1 to CY2-6, a moiety represented by

is selected from groups represented by Formulae CY3-1 to CY3-6, and a moiety represented by

is selected from groups represented by Formulae CY4-1 to CY4-15:

wherein, in Formulae CY1-1 to CY1-8, CY2-1 to CY2-6, CY3-1 to CY3-6, and CY4-1 to CY4-15, X₁ to X₄, X₁₁, R₂, R₃, R₁₄, and R₁₅ are respectively the same as described in claim 1, X₄₁ is O, S, N(R₄₁), C(R₄₁)(R₄₂), or Si(R₄₁)(R₄₂), R_(2a) and R_(2b) are respectively the same as described in connection with R₂ in claim 1, R_(3a) and R_(3b) are respectively the same as described in connection with R₃ in claim 1, R₄₁, R₄₂, R₄₄, and R₄₅ are respectively the same as described in connection with R₄ in claim 1, R₁₄, R₁₅, R₂, R_(2a), R_(2b), R₃, R_(3a), R_(3b), R₄₁, R₄₂, R₄₄, and R₄₅ are not each independently hydrogen, * indicates a binding site to M in Formula 1, in Formulae CY1-1 to CY1-8, *′ indicates a binding site to T₁ in Formula 1, in Formulae CY2-1 to CY2-6, *′ indicates a binding site to T₁ in Formula 1, and *″ indicates a binding site to T₂ in Formula 1, in Formulae CY3-1 to CY3-6, *′ indicates a binding site to T₃ in Formula 1, and *″ indicates a binding site to T₂ in Formula 1, and in Formulae CY4-1 to CY4-15, *′ indicates a binding site to T₃ in Formula
 1. 14. The organometallic compound of claim 1, wherein the organometallic compound is represented by one selected from Formulae 1(1) to 1(6):

wherein, in Formulae 1(1) to 1(6), M, X₁ to X₄, CY₁ to CY₄, T₁ to T₄, n, R₂ to R₄, and a2 to a4 are respectively the same as described in claim 1, CY₅ to CY₇ are each independently a C₅-C₃₀ carbocyclic group or a C₁-C₃₀ heterocyclic group, X₅ to X₇ are each independently C or N, R₅₁, R₆₁, and R₇₁ are respectively the same as described in connection with R₂ in claim 1, a51, a61, and a71 are each independently 0, 1, 2, or 3, T₅ is C, Si, or Ge, T₇ is B, N, or P, T₆ is selected from a single bond, *—N[(L₇)_(c7)-(R₇)]—*′, *—B(R₇)—*′, *—P(R₇)—*′, *—C(R₇)(R₈)—*′, *—Si(R₇)(R₈)—*′, *—Ge(R₇)(R₈)—*′, *—S—*′, *—Se—*′, *—O—*′, *—C(═O)—*′, *—S(═O)—*′, *—S(═O)₂—*′, *—C(R₇)═C(R₈)—*′, *—C(═S)—*′, and *—C≡C—*′, L₇ and c7 are respectively the same as described in connection with L₅ and c5 in claim 1, and R₇ and R₈ are respectively the same as described in connection with R₅ in claim
 1. 15. The organometallic compound of claim 1, wherein the organometallic compound is selected from Compounds 1 to 15:

wherein, in Compounds 1 to 15, Ph indicates a phenyl group.
 16. An organic light-emitting device comprising: a first electrode; a second electrode; and an organic layer disposed between the first electrode and the second electrode, wherein the organic layer comprises an emission layer and the organometallic compound of claim
 1. 17. The organic light-emitting device of claim 16, wherein the first electrode is an anode, the second electrode is a cathode, the organic layer further comprises a hole transport region disposed between the first electrode and the emission layer and an electron transport region disposed between the emission layer and the second electrode, the hole transport region comprises a hole injection layer, a hole transport layer, an electron blocking layer, a buffer layer, or any combination thereof, and the electron transport region comprises a hole blocking layer, an electron transport layer, an electron injection layer, or any combination thereof.
 18. The organic light-emitting device of claim 16, wherein the emission layer comprises the organometallic compound.
 19. The organic light-emitting device of claim 18, wherein the emission layer further comprises a host, wherein an amount of the host is greater than that of the organometallic compound.
 20. A diagnostic composition comprising at least one of the organometallic compound of claim
 1. 